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Hello!

I would like to ask if the verb of the sentence below has a future perfect progressive tense:

"Trixie will have been keeping her secrets behind her mom."

Also, can you give me the difference of past tense and past perfect tense, with illustrations?

Thank you very much.
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'will have been keeping' is future perfect progressive, yes.

Past: I answered the question. (Add -ed for most regular verbs.)
Past perfect: I had answered the question. (Use "had" and the -ed form for most regular verbs.)

CJ