He was seen to cross the street when a car bumped into him.中的to cross是什么用法?改成crossing对么

He was seen to cross the street. He was seen to cross the street.请划分一下句子成分 一道英语被动语态选择题He ________ cross the street.A.seesB.saw ...toC.was seenD.was seen to He was seen to cross the street when a car bumped into him.中的to cross是什么用法?改成crossing对么 He was always cross. he was seen to hang out.为什么要to He was seen to have entered the room.啥意识 He was nowhere to be seen.为什么要用不定式 He was seen to go into the room 这里为什么SEEN后加TO (seen)to entered the room ,he was asked to the policeman.为什么不是having been seen? he was seen to drink.这个句子对吗? he was seen drinking.呢?he was seen drinking in / at a restaurant.应该用哪一个冠词呢?谢谢大家 英语翻译he was cross .you are cross.i am cross .i was cross A car knocked the boy over.He was begining to cross the road.(as) a car knocked the boy over.he was beginning to cross the road(as) he was beginning to cross the road as a car knocked the boy over. he ____ by his sister at that moment.A.happened to see B.was happened to see C.was happened to be seen D.happened to be seen He — by his sister at that moment.A. happened to see B. was happeded to see C. was happened to be seen D. happened to be seen he was seen to go out by me为什么要用to go