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⑴ Present perfect with for and since

We can use the present perfect with since and for to talk about something thatstarted in the past and continues up to the present.

for

·Use the present perfect with for to talk about a period of time.

例句：I‘ve studied English for six years.

          We've lived in Berlin for three months.

since

·Use the present perfect with since to talk about when a situation started.

例句：I’ve studied English since 2016.

          We've lived in Berlin since June.

⑵ present perfect with just, already and yet

We use just, already and yet with present perfect verbs to talk about things that have happened before now but have a connection with now.

just

·Use just to talk about something that happened a short time ago.We put just between have/has and the past participle.

例句：I've just spoken to my friend Paul.

         My dad has just got home from school.

already

·Use already to talk about something that happened before now or before we expected.

例句：We‘ve already told Mike where the match is.(Mike knows,so you don't need to tell him.)

          Have you already finished your homework?That was quick!(The speaker did not ecpect this.)

          I've already had my lunch.(I'm not hungry now.)

·We put already between have/has and the past participle or the end of a sentence.

例句：I've already seen him./I've seen him already.

yet

yet(=until now)is used in negative sentences and quetions to talk about things we plan to do in the future,but which are not done.Yet is placed at the end of a sentence:

例句：Have you finished your homework yet?

         I haven't read your email yet.

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