Question 1

What is the difference between "haven't" and "hasn't" in present perfect?

Accepted Answer

"Haven't" is the contraction of "have not" and is used with the subjects I, you, we, and they: "I haven't seen the new film," "They haven't arrived yet." "Hasn't" is the contraction of "has not" and is used with third person singular subjects — he, she, and it: "She hasn't called," "It hasn't rained for weeks." The pattern matches the positive present perfect: "have" goes with I/you/we/they, and "has" goes with he/she/it. In exam questions, check the subject carefully before choosing the helper verb. A common trick in Cambridge exams is to place the subject far from the gap, making it harder to identify which form is needed.

Question 2

Where does "yet" go in a negative present perfect sentence?

Accepted Answer

"Yet" typically goes at the end of negative present perfect sentences and questions. In negatives, it means "up to this point in time, but expected in the future": "I haven't finished yet" means I have not finished but I expect to finish. In questions, it asks whether something expected has happened: "Have you finished yet?" In formal or literary English, "yet" can occasionally appear before the main verb — "I have not yet received a reply" — but this is less common in everyday speech. Note that "yet" is not used in positive statements; for positive sentences expressing the same idea, use "already" or "still": "I have already finished" or "I still haven't finished."

Question 3

Can I use "never" and "not" together with present perfect?

Accepted Answer

No — using "never" and "not" together creates a double negative, which is incorrect in standard English. "I haven't never been to France" is wrong. You must choose one negative form: either "I haven't been to France" (using "not") or "I have never been to France" (using "never"). Both sentences mean the same thing, but "never" is slightly more emphatic. In Cambridge exams, error correction tasks sometimes include double negatives as the mistake you need to find. Remember that "never" already means "not at any time," so adding "not" creates a logical contradiction. Other negative words that work this way include "nothing," "nobody," and "nowhere."

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