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I didn't been to London.
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I hadn't been to London.
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The helping verb had / hadn't is used in the past perfect.
|
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When I saw him, I noticed that he had a haircut.
|
When I saw him I noticed that he had had
a haircut.
|
The action (haircut) which happened before another past action must be
put into the past perfect to make the time order clear to the listener.
|
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He told me has been to London.
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He told me he had been to London.
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His original words were: ''I have been to London.'' However, in reported
speech we move the tense back - the present perfect (have been)
becomes past perfect (had been).
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