Present Perfect Tense – Already, Yet, Since and For

Already means that something happened earlier than we expected. With Present Perfect already usually goes after have or has and before the main verb.
Examples

We’ve already had our breakfast.
When are you going to do your homework?
But I’ve already done it!
Do you want a cup of coffee?
No, thanks. I’ve already had one.
Yet means that something that we expected has happened or hasn’t happened. We usually put it at the end of a sentence.
Examples
Has the post arrived yet?
Have you done your homework?
Not yet.
Haven’t you got ready yet? Look at the time!

We use for with a period of time, for example: a few days, half an hour, two years. We use since with the time when the action started, for example: last year, June 8, I met you.

Exercise 1: Say what you have already done (+) and what you have not done yet (-).

____________________________________ (+/already/to listen to music)
____________________________________ (-/not/to go swimming/yet)
____________________________________ (+/already/to take some photos)
____________________________________ (+/already/to help Jane in the kitchen)
____________________________________ (-/not/to play the guitar/yet)
____________________________________ (+/already/to have fun with my friends)
____________________________________ (-/not/to wash my shirts/yet)
____________________________________ (-/not/to make my bed/yet)
____________________________________ (+/already/to do the washing-up)
10.____________________________________ (-/not/to speak to my maths teacher/yet)