English grammar

Question

what is the difference in meaning in the following sentences; and how would you explain it to student?

I bought a news paper this morning.
I have bought a news paper this morning.

Did you remember to sign the letter?
Do you remember signing the letter?

He didn't need to call the doctor.
He needn't have called the doctor.

AlpheccaStars · Accepted Answer

I bought a newspaper this morning. (This is the best way to say a one-time competed event in the past.)
I have bought a newspaper this morning. (It's not wrong, but it is not what a native speaker would say.)

I have read the newspaper this morning. (This is more natural. It describes sn event that was just completed, and required a length of time.)

Did you remember to sign the letter? (I am reminding you that the letter required your signature.)
Do you remember signing the letter? (Do you remember the actual action of signing?)

He didn't need to call the doctor. (The patient was not very sick, so he did not call the doctor.)
He needn't have called the doctor. (He called the doctor, but the doctor told him that his services were not necessary. He would get better whithout any special treatment..)

English grammar

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