He is now working at a bank 请问NOW为什么可以放系动词后

He is now working at a bank 请问NOW为什么可以放系动词后 he is now working at a bank. he is now working at a bank 这里now的位子可以换么 那么为什么but he is now working at a bank中却用at? is now working at a bank but he is now working at a bank. Tony saw me and came and sa He is working at the office now his is now working at a bank 这句话是什么时态 英语翻译对不起，第一句应是He is working at a bank now.另外，这个句子是新概念2 上的，的回答 he is working ( )a model plane now. a.on b.at c.for d.in his parents are working in the factory and he is now at home He is a student at a medical college now.