Can't have (been) V.S. couldn't have (been)
88730
can't have been vs. couldn't have been
16297
When to use "have" and "have got"
108964
Difference between "I haven't" and "I've not" etc
63876
What's the negation of "I used to be"? Surely not "I didn't used to be"?
1227
Could vs Might vs May
27613
Past Perfect Continuous/Past Perfect or?
8043
Verb forms for "any" and "none" — have or has?
118270
Difference between "has + verbed" and "had + verbed"
66576
Use "got" or "have got"?
14431
Might / May / Could / Would have been able to
144020
"Cannot help but think" vs. "cannot but think" vs. "cannot help thinking"
92969
"got" vs. "have got"
150181
"Covered with" vs. "covered in" vs. "covered by"
114229
What is the difference between "were" and "have been"?
157446
"Can" vs. "could" in asking a question
71914
"Didn't use to get" or "Didn't used to get"?
150189
past continuous or past simple