Questions about Past Perfect tense

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2
votes
4answers
345 views

“when I clicked on video file nothing has happened”

when I clicked on video file nothing has happened. Is that correct?
0
votes
1answer
1k views

Using had twice [duplicate]

Possible Duplicate: What does “had had” mean? How does this differ from “had”? Is this correct usage? I had had enough food?
1
vote
2answers
2k views

Verb Forms and Their Usage

What is meant by "present perfect", "past perfect", and "future perfect" verbs? How can I identify them or know which is which?
14
votes
7answers
40k views

What does “had had” mean? How does this differ from “had”?

For example, what is the difference between the following two sentences: I had a bad day I had had a bad day
10
votes
2answers
11k views

Why do people sometimes use the past perfect form of a verb when the past would suffice? (e.g. “you had mentioned”)

I noticed that my American friends tend to use the past perfect form when they use the verb mention in its past form, almost despite of the context of the sentence. I hear them say "you had ...