回想起到底是think back to还是 think back on

回想起到底是think back to还是 think back on look back on还是to,think back on 还是to think back to还是 think back on 还是两者都有.look back on还是look back think back 和 recall 表示回想时一样吗 Think back中文意思是? ------the accident,I deeply felt afraid.是用Think back to 还是 T I think back to the first time 句中,back是副词,to 是介词? think back think out意思 用think back造句! What do you think of +doing 还是别的 Tom has to ____ (come)back think back on these three years,many things moved me think back on these three years,many things moved me这是祈使句吗?