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as和as if作为好像的意思时有什么区别?

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as和as if作为好像的意思时有什么区别?
比如说这两个句子:
He looked just as he had looked ten years before.
She looked as if she were ten years younger.
as和as if作为好像的意思时有什么区别?
比如说这两个句子:
He looked just as he had looked ten years before.
这个句子是陈述语气
他看上去就像他10年前的样子.(说明他像10年前一样年轻)
She looked as if she were ten years younger.
这个句子是虚拟语气
他看上去,好象他年轻了10岁,实际上不是这样的.
再问: He looked just as he had looked ten years before. 这里面had looked不是虚拟语气吗?为什么要用过去完成时态啊?
再答: He looked just as he had looked ten years before. 这里面had looked不是虚拟语气吗?为什么要用过去完成时态啊? 因为主句已经是一般过去式了,从句动词发生在主动动作之前,表示过去的过去,因此用过去完成时 满意,请立即采纳,谢谢!