when i came into the room ,he pretend to be doing his homework 为什么是 be doing 而不是 to do形容词才要加be 为什么这里要加个beshe pretended to be innocent 为什么nnocent 前面也要加be 不定式to do什么情况下变成to b

I found him _____(watch) TV when I came into the room When I came into the classroom,I found Tom____ (do)his homework. I was watching TV when he came into the room——（轻轻地） They ___(clap) their hands happily when I came into the classroom When I came into the room,they ___(plan) to go on a trip i found a letter -- on the floor when i came into the classroom A lying B lay Clie D lies When the teacher came into the classroom,we stopped t________ The shoplifter ____(put) a sweater into his bag when I came into the shop.I caught him by the armat once. .When I came into the house,the boy there looked 20.When I came into the house,the boy there looked 20A me ______ surprise.A.at; in B.for; to D.by; for D.up; over When I came into the room=（）,I found him lying there asleep请问那一个空怎么写啊 When I came into the room,he pretended ________ asleep．A.being B.be C.to be D./ When I came back into the house ,it _____(rain) harder and harder.这个空填was raining 为什么? when I came into the classroom,my English class had been on for 10 minutes.中on的句子成分 It's an old photo of my father,I __it when I was looking for my psaaport the other dayA came into B came about C came across D came on When I came into the room,I found he sat still,his eyes (fixed)on the ceiling,(lost)in thought.fixed以及lost是什么用法,为什么这么做? Mary came into the ba ras i was giong to When I came into the room,I found him ____ in writing his doctoral dissertation.A.involved B.involving C.concentrated D.concentratingWhy When I came into the room,I saw him _______ his homework.A、did B、does C 、doing D、to do