I couldn’t understand why he pretended _________ in the bookstore

I couldn’t understand why he pretended _________ in the bookstore
I couldn’t understand why he pretended _________ in the bookstore

I couldn’t understand why he pretended _________ in the bookstore
not to be

你想问什么啊？

I couldn't understand why he pretended to be in the bookstore. 我不能明白他为什么假装自己在书店.

not to have been