What___you ___for ?(look).I ____for my English book(look).___ you ____it (see)

are. looking. am looking. Have seen

你在找什么？（用现在进行时）
我在找我的英语书（还是进行时）
你看到过它吗？（问是否曾经看到过书，用完成时）

What are you looking for ?([你在找什么？]look).I am looking for my English book[我正在找英语书](look).Have you seen it [你看见了没有？](see)

What are you looking for?
I'm looking for my English book.
Can you find it?

what are you looking for?
i looked fo my english book
have you seen it?

What are you looking for ?(look).I am looking_for my English book(look).Have you seen_it (see)

你（正）在找什么？我（正）在找我的英语书。你（曾经）看过吗？

What are you looking for?
I am looking for my English book.
Have you seen it?