as if和as though除了可以引导表语从句,可以引导其他的名词性从句吗

名词性从句只有表语从句,但还可以引导状语从句.
as if 是连词词组,相当于 as though ,意为“好像,好似”,引导表语从句和状语从句.
1 .as if 引导表语从句.
as if 引导表语从句时,可以和 as though 互换,其句型为：“It looks / seem as if …”,其中 it 本身无词义,是无人称代词,looks / seems 是连系动词,as if 引导表语从句.例如：
It looks / seems as if you have got no experience .看来你似乎并没有经验.
2 .as if 引导方式状语从句.
as if 引导的方式状语从句中,从句中的动词一般要用虚拟语气.若表示与现在事实相反的主观设想,动词用过去式 (be 用 were ,适用于各种人称)；若表示与过去事实相反的主观设想,动词用“had + 过去分词”形式.例如：
He acted as if he were smoking .他那举动好像他抽烟似的.
They talked as if they had been friends for years .他们说话很亲热,就像多年的老朋友似的.