The right usage of past perfect tense
103953
"I didn't know" or "I haven't known"?
99870
Which tense to use in an academic paper when referring to past research?
8497
When is the past perfect exactly needed?
114989
The logic behind present perfect/infinitive + present perfect
90991
Adverbs + Present Perfect
91575
Past simple vs past perfect; British- vs American English
53495
Why is 'present perfect' present if it happened in the past? And why is it 'perfect'?
110190
tense agreement (simple past tense after past perfect tense)
152550
present tense with past perfect?
16077
Can the present perfect continuous construct be used in passive voice?
97441
Present perfect or simple past?
100002
Past Simple vs. Present Perfect
47451
Present Perfect or simple past?
12019
Can we use the present perfect in this case?
78336
past simple or present perfect
129784
Is it right to use a singular form of the verb in this sentence?
21925
Why do people sometimes use the past perfect form of a verb when the past would suffice? (e.g. "you had mentioned")