COULD vs. COULD HAVE when talking about the past
34504
"could have" vs "could"
58714
Simple Past vs. Present Perfect: "was" vs. "has been"
23177
Tense change: previous actions on something that's currently true
116929
Past Simple vs. Past Progressive
34087
Should I use "could" or "would" in the following case?
141351
"it be" instead of "it could/would be"
92516
"Might have" vs "could have"
108399
Is this sentence correct? Usage of would have been and had
15952
"would rather" + subject + past subjunctive
97227
"Has" vs. "have"
28323
When do I use "can" or "could"?
41712
"can have done" structure?
10955
Past simple vs present perfect
47469
Present or Past tense to describe a past condition which is still present?
148617
If something was vs If something were
118206
Simple past vs. past perfect
142105
Difference between Can/Could: "Can (could) you sell your old computer to me?"