present perfect tense..plzzz :)

[lindadanca]

Hello,

Could you please check if the sentences which i wrote are correct or not.

1)I have finished University of Dormund and 2 years later (or then ) i have studied for doctorate and later I have come back.

or

I have finished University of Dormund and 2 years later i studied for doctorate and later I came back.

2)I have bought a car recently and I have sold it.

Thanks

[Raymott]

Hello,

Could you please check if the sentences which i wrote are correct or not.

1)I have finished University of Dormund and two years later (or then ) I have studied for a doctorate. later Now, I have come back.
No need for present perfect in the first two instances. In the last sentence, it is warranted.
I'm not sure what the status/function of "(or then)" is in your sentence.

I have finished University of Dormund and two years later i studied for doctorate. Then later I came back.


2)I have bought a car recently and I have sold it.
No need for present perfect.
Thanks

Why do you want to use the present perfect in these places?

[lindadanca]

I just wanted to learn what will hapen if I write those sentences successively. I know we make them by 'simple past' .

[lindadanca]

A : Have you cleaned my t-shirt?

B : Yes, I have

A : Hmm...I think coffee has been dropped on this t-shirt (or coffee was dropped on this t-shirt ) (which one ? )

B :I see...You should clean it again

OR

A :Have you cleaned my t-shirt?

B :Yes I have but I dropped coffee on that t-shirt and then I cleaned it again 1 hour ago.

[5jj]

A : Hmm...I think coffee has been dropped on this t-shirt (or coffee was dropped on this t-shirt ) (which one ? )
B :I see...You should clean it again

In this particular example, both are possible. We could be thinking of the present consequence of the past coffee-spilling, or the past coffee-spilling itself.

Incidentally, we normally 'spill', not 'drop' coffee on clothing, and we 'wash', not 'clean' T-shirts.

[lindadanca]

Is it important the coffee to spill on the t-shirt after washing it if we use 'present perfect tense' ?

Yes I have washed then I droped coffee on it.
or
Yes I have washed then I have dropped coffee on it.

[5jj]

Yes I have washed it then I dropped coffee on it.

That is unlikely. If the washing preceded the spilling, then it is clearly viewed as an occurrence in past time = past tense.

[lindadanca]

Thank you,

Last question for present perfect.

A: Have you finished your homework?

B: Yes, I did

or

A :Did you finish your homework?

B :Yes, I have

Thanks

[5jj]

A: Have you finished your homework? .....B: Yes, I didhave.

or

A :Did you finish your homework?.....B :Yes, I have did.

We usually answer the question we have been asked; we can change tense later, if this is appropriate.

A: Have you finished your homework?
B: Yes. I finished it an hour ago.

Yes is sufficient to answer the question. The answer is then expanded.