“把...同...分开”be separated from serve表“服务”时为及物动词，不用➕介词 serve as“充当......”不用被动语态 serve one right罪有应得 “为...树立榜样”set a good example to sb. 开始做某事set out to do sth.＝set about doing sth. “出发去...”set off for... put up和set up都有“修建”的意思，但只有set up有“成立机构”之意 several只能与可数名词复数连用