Present Tenses

Why A is correct:
"Plays" is the correct third-person singular present tense form. Since Mark (he) usually does this action regularly on Sundays, we need present tense, and "plays" is the right form for "he/she/it."

Why the others are wrong:
- B (play) – This is the base form used only with "I," "you," "we," or "they," not with "he/she/it"
- C (played) – This is past tense, but the sentence is about his regular habit, not something that already happened
- D (playing) – This is a gerund/present participle; it doesn't work as the main verb here without a helping verb like "is"

A. understand ✓

• After "can't," you need the base form of the verb (infinitive). "Can't understand" is correct.
• B (understood) is past tense—wrong after "can't."
• C (understands) is third-person singular—wrong after "can't" and doesn't fit the structure.
• D (understanding) is a gerund/participle—"can't understanding" isn't grammatical; we say "can't understand."

A. leaves ✓

• This uses the simple present tense, which is correct for stating a scheduled future event (like train departures).
• English uses present tense for timetables and fixed schedules, even though they refer to the future.

B. leave ✗
- Wrong verb form. "Leave" needs an 's' with third-person singular subjects (the train = it).

C. leaving ✗
- This is a gerund/participle, not a complete verb. The sentence needs a conjugated verb, not just an -ing form.

D. left ✗
- This is past tense, but the sentence clearly says "tomorrow morning," which is future, not past.

Correct answer: A. starts

• Use the simple present tense for scheduled events (like meetings, seminars, flights, classes). "The seminar starts at 10 a.m." sounds natural and is the standard way to talk about fixed timetables.

Why the others are wrong:

• B. will start — Too informal for a scheduled event; "will start" suggests uncertainty, not a set schedule.

• C. is starting — Present continuous suggests something happening right now or in progress, not a future scheduled time.

• D. run — Wrong verb form; should be "runs," but even then, simple present (starts) is more natural for schedules.

A. been working ✓

This sentence needs the present perfect continuous tense because:
- "for seven years" shows an action that started in the past and continues to the present
- "been working" (have + been + -ing) correctly expresses an ongoing action over a time period

Why the others are wrong:
- B. work – Simple present; suggests a habitual action, not a continuous period
- C. worked – Simple past; suggests the action ended, but "for seven years now" implies it's still happening
- D. working – Incomplete; missing the auxiliary verbs "have been"

Correct answer: A. was written

The sentence needs passive voice because the subject (Hamlet) is receiving the action, not performing it. Shakespeare wrote the play, not the other way around. "Was written" correctly shows that Hamlet is the thing being created.

Why the others are wrong:
- B (wrote): Active voice—this would mean Hamlet did the writing, which is backwards
- C (writes): Present tense and active voice—Hamlet isn't writing anything, and Shakespeare wrote it in the past
- D (write): Base verb form—doesn't match the grammatical structure needed here (no subject-verb agreement either)

A. have worked ✓
This uses the present perfect tense, which shows an action that started in the past and continues to affect the present. It's the right choice because she's describing her ongoing effort toward current goals.

B. have working ✗
This is grammatically incorrect. "Have" needs a past participle (worked), not a gerund (working).

C. am work ✗
This doesn't make sense grammatically. "Am" pairs with present participles (-ing form), so it would need to be "am working"—but that wouldn't fit the context of the sentence structure here.

D. worked ✗
Simple past tense suggests the effort is completely finished, but the context suggests it's still ongoing. "Have worked" better shows she's still working toward those goals.

Correct Answer: A. has been designed

This sentence needs the passive voice because the building (subject) is being acted upon—someone designed it, not the other way around. "Has been designed" is the present perfect passive, showing a completed action with present relevance (the building is now ready). This is the most natural choice.

Why the others are wrong:

• B. designs – Active voice, wrong direction (buildings don't design themselves)
• C. is designing – Present continuous passive; suggests the designing is still happening, but the sentence implies it's finished
• D. designed – Past tense, missing the auxiliary verb; sounds incomplete and awkward in standard English

Correct Answer: A. has been working

This sentence needs the present perfect continuous tense because it describes an action that started in the past and continues to the present. The phrase "for the past three months" is a key signal—it shows ongoing duration up to now.

Why the others are wrong:

• B. works – Simple present tense; doesn't show the action started in the past or has been continuous
• C. worked – Simple past tense; suggests the action finished and is completely over, but "for the past three months" implies it's still happening
• D. is working – Present continuous; only describes what's happening right now, not the full three-month period

Correct answer: has received
This uses the present perfect tense, which describes an action that happened in the past but is still relevant to the present. She completed her degree at some point before now, and that accomplishment matters today.

Why the others are wrong:
- B (receives) – Simple present tense suggests she's currently receiving the degree, which doesn't make sense.
- C (received) – Simple past is grammatically correct but less natural here; present perfect better shows the degree is now part of her qualifications.
- D (receive) – Wrong verb form; "receive" needs a subject like "I/you/we/they" or "to receive" (infinitive).

Why D is correct:
"Is always" uses the correct word order (verb + adverb) and "is trying" matches the present continuous tense needed for an ongoing effort. This pairing shows a habitual state ("is always late") contrasted with a continuous action ("is trying").

Why the others are wrong:
- A: "is always" is correct, but "is trying" doesn't match the parallel structure—you need simple present "tries" to match the habitual nature of the first clause.
- B: "always is" reverses normal English word order; adverbs typically come after the first auxiliary verb, not before it.
- C: Same word-order problem as B ("always is" is incorrect).

Why A is correct:
"Am having" uses the present continuous tense, which is the natural way to talk about a planned future event in English—especially something scheduled or arranged.

Why the others are wrong:
- B (have): Simple present tense sounds too general/habitual; "I have a meeting" could mean you always have meetings, not specifically tomorrow
- C (will have): While grammatically possible, "will have" sounds more uncertain or spontaneous; "am having" is better for pre-arranged plans
- D (having): This is just a verb form fragment with no auxiliary verb—it's incomplete and ungrammatical

A. am working ✓

This sentence needs the present continuous tense (am/is/are + -ing) because the action is happening *right now* at this moment. "I am working" shows the project is in progress.

Why the others don't work:
- B. work — Simple present tense means a regular habit, not something happening right now
- C. works — Wrong subject (uses "he/she/it" form, not "I")
- D. working — A bare -ing form doesn't work without "am"; you need the helping verb

Correct answer: A

Why A is right:
- "Has been studying" is present perfect continuous—it shows an action that started in the past and continues to now, which matches "for years"
- "Wants" is simple present—it expresses a current desire or goal

Why the others are wrong:
- B: "Studies" is simple present, which doesn't work with "for years" (it suggests a repeated habit, not duration)
- C: "Wanting" is a gerund/participle—it's incomplete without a helping verb and changes the grammar structure
- D: "Study" and "want" are base verbs with no conjugation—they need subjects and don't match the third-person "he"

Why A is correct:
"Dictates" (singular verb) agrees with the singular subject "policy." "Work" is the base verb form needed after "dictates that all employees"—you need the bare infinitive here, not a gerund or conjugated form.

Why the others are wrong:
- B: "Works" is third-person singular, but it follows "employees" (plural), creating a mismatch.
- C: "Working" is a gerund (noun form), but you need the infinitive verb form after "dictates that."
- D: "Dictate" is plural, but "policy" is singular, so subject-verb agreement fails.

Correct answer: A (departs - are advised)

• "Departs" is the simple present tense, which is standard for scheduled events like flights—it shows the flight is on the timetable.
• "Are advised" is passive voice, which correctly shows that passengers receive advice from someone else (the airline).

Why the others are wrong:

• B & D: "Is departing" (present progressive) suggests the action is happening right now or very soon, not a scheduled future event.
• B: "Are advising" is active voice, incorrectly making passengers the ones giving advice rather than receiving it.
• C: "Advise" (active voice, base form) doesn't work grammatically here—you need a passive verb form to show passengers are being advised.

Why A is correct:
The adverb "always" goes after the verb "is" in English (you say "is always," not "always is"). "Finds" is the simple present tense, which correctly matches the habitual nature of both actions.

Why the others are wrong:
- B: "Always is" reverses the correct word order for adverbs with "be" verbs.
- C: "Is finding" uses present continuous, which suggests an action happening right now—but we need simple present for a general habit.
- D: Combines two errors: wrong adverb placement AND wrong verb tense for habitual actions.

Why A is correct:
"Has earned" (present perfect) shows a completed action with present relevance—she finished her degree and still has it. "Considers" (present simple) expresses her current view that it's significant. Together they describe a past achievement she currently values.

Why the others are wrong:
- B "earned - is considering": "Is considering" suggests she's still deciding whether it's significant, which doesn't fit the confident tone about a clear achievement.
- C "has been earning - considered": "Has been earning" implies ongoing study (she's still working toward it), and "considered" (past) contradicts the present relevance of her view.
- D "earns - considers": Present simple "earns" wrongly suggests she's currently earning a degree as an ongoing action, not a completed one.

A. drinks ✓

"He always" is a present tense habit, so you need the present tense verb "drinks." The subject "he" (third person singular) also requires the "-s" ending.

Why the others are wrong:
- B. drink – Wrong form for third person singular (should be "drinks")
- C. drank – Past tense; doesn't match "always" (a present habit)
- D. drinking – This is a gerund/participle, not a complete verb for this sentence