have worked vs had worked
1863
How do the tens­es and as­pects in English cor­re­spond tem­po­ral­ly to one an­oth­er?
5929
"I have" vs "I have got"
151460
Difference between "was to . . ." and "was to have"
60512
"Would have" in conditional clauses
137339
"Has/Have/Had" as a main verb and auxiliary verb
40342
'Have just finished' vs. 'Just finished': What is the difference?
102512
What is the difference between "being" and "having been" in this context?
10955
Past simple vs present perfect
72276
Have gone or Have been
142736
Difference between "are you done" and "have you done."
93445
Had it not been vs If it were not for
655
"How it works?" vs. "How does it work?"
44646
"To work for" vs. "to work in" vs. "to work at"
75236
"have read" vs "read" - Is this simple present vs present perfect?
13947
Simple past or present perfect?
66576
Use "got" or "have got"?
47408
Difference between "been to" and "been in"