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Hello,

Could you check if there are any mistakes in these examples?

1.Alex is an artist. He has drawn/drew many beautiful pictures in his lifetime.

2.Jack really needs to get in touch with you. Sice this morning, he has callled/called here four times. He called/has called at 9:10, 10:25, 12:15 and 1:45.

3.Janet has worn her new dress only once since she bought/has bought it.

4Speaker A:.I have not been able/wasn't able to reach Mr. Chang yet. So far he has not responded/didn't respond to any of my attempts to reach him.

Speaker B: Oh!

Speaker A: I started trying to reach him three days ago. Since then, I have faxed /faxed him twice. I have phoned/phoned him four times. And I have sent/sent at least six emails.

Speaker B: I guess modern communications don't mean much if there is no one at the other end.

Is it always required to use present perfect after 'since'?

Thanks
Comments  
All OK.

Is it always required to use present perfect after 'since'?-- It is wrong to use present perfect AFTER 'since' (except in certain very limited cases where the action is also a continuing one), but present perfect almost always appears in the OTHER clause.
Could you give me an example where it is used? Should I always use present perfect after 'so far'? And was it possible to use past simple in either of those exampes?

Here;
2.Jack really needs to get in touch with you. Sice this morning, he has callled/called here four times. He called/has called at 9:10, 10:25, 12:15 and 1:45.

Here
4Speaker A:.I have not been able/wasn't able to reach Mr. Chang yet. So far he has not responded/didn't respond to any of my attempts to reach him.

And here

Speaker A: I started trying to reach him three days ago. Since then, I have faxed /faxed him twice. I have phoned/phoned him four times. And I have sent/sent at least six emails.

Thanks
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Could you give me an example where it is used?-- Where what is used?
Should I always use present perfect after 'so far'?-- Probably.
And was it possible to use past simple in either of those examples?-- No, not really if you want to maintain the grammar. Of course, natives can say anytbing—especially Americans.
I meant the use of present perfect after 'since' in certain very limited cases, as you say.

Thanks
Ah.

It has been a while since you have done interviews.
Has your concept of caring changed since you have become involved in student teaching?
Have you been drunk since you have been with the Chicago White Sox team?
Students: We have free audio pronunciation exercises.
Thank you Emotion: smile