Affirmative (Positive)

We had won 3 gold medals by 1pm on the first day.

Form: Subject + had + verb (past participle)

Negative

I had not eaten fish and chips until I came to the UK.

Form: Subject + had + not + verb (past participle)

Question (Interrogative) 

Had you ever played baseball before you moved to the USA?

Form: Had + subject + verb (past participle)?

Lesson Summary

Here is how the past perfect tense is formed in its affirmative, negative, and interrogative forms:

• Affirmative: Subject + had + verb (past participle)
  Example: We had won 3 gold medals by 1pm on the first day.
• Negative: Subject + had + not + verb (past participle)
  Example: I had not eaten fish and chips until I came to the UK.
• Question (Interrogative): Had + subject + verb (past participle)?
  Example: Had you ever played baseball before you moved to the USA?