didn't have or didn't had with if
26184
Why do we use the base form of verbs instead of the past form in past tense questions?
151460
Difference between "was to . . ." and "was to have"
101208
we have had or we had
132461
NOT IN vs NOT EXISTS
69421
Which tense after 'would I... if.... ?'
12613
How to use "had" correctly in a past perfect paragraph?
105201
" could " vs. " could have "
6180
Error: 'else' without 'if'
87312
Using 'is' or 'was' when something is still true
62652
Use "have" or "has" any/anyone/anything in the question?
120497
"Would have been" or "Would be"
88730
can't have been vs. couldn't have been
25137
3rd conditional form ("If I had X, I would ..."?)
5488
"If I would have lost you" vs "If I had lost you"
68970
Does it have or has?
7614
"Whether or not" vs. "whether"
123682
Can I use an "if" clause without "then"?