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as if,as though,as it were,look like 它们都有“仿fo、好像” 之意。
as if,as though是连词，前者更常见些。当内容属实时。从句使用一般时态；当内容不是事实时,从句使用虚拟语气：He spoke to me as ifl were a child.“他跟我说话的口气好像我是个小孩子似的。”It looks as if it is going to rain.天看上去要下雨了。
as it were 是虚拟表达,句法上用作插入语,表示 “可以说是”：He is my best friend,my second self,as it were.“他是我最好的朋友,可以说是我第二个自我。
look like是动词短语，“看起来好像”：It looks like rain.“天看上去要下雨了。
