摘要： I feel it's necessary for me to visit them. 我觉得拜访他们是有必要的.I should get there earlier. 我需要提前到达.I must write him a letter. 我必须写信给他.I'm expected to call her back. 我得给她回电话.I feel it's my duty. 我觉得我有义务. 阅读全文