以as if (as though)引导的方式状语从句或表语从句,有时用虚拟语气,若表示与现在事实相反,谓语动词用一般过去时;若表示与过去事实相反,用过去完成时;表示将来的可能性不大,用would (might, could)+动词原形:He acts as if he knew me. 他显得认识我似的。They treat me as though I were a stranger. 他们待我如陌生人。He talks as if he had been abroad. 他说起话来好像曾经出过国。
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