麻烦帮忙看看这句话!请问I was trained to be a doctor.在这句话里,为什么to后腰加be啊?我

麻烦帮忙看看这句话!请问I was trained to be a doctor.在这句话里,为什么to后腰加be啊?我 It must be terrible to be grown up!这句话里为什么要加be呢? I'm going to be a doctor.Be there or be square.为什么加be? 请问这句话里的be raised not to I must be a difficult man to find a flatmate for这句话里为什么要有for be committed to 在这句话里怎么解释? 请问高手这句话的意思 it was like it was mean to be To be with him was amusing.he was amusing to be with这两句话去呗在那 It give me quite a shock to be told I was seriously ill这句话中t 英语好的进,I have to be going now,——这几句话为什么要加ing I told him I want to be a teacher in the future.这句话里的 want要不 the last thing I wanted was for dad to punish me 这句话中be for