第一句:It seems that…句型也可以转换成 名词或代词 + seem + 动词不定式的句型,其原意不变。如果动词不定式为to be + 形容词时,to be往往省略。如:
It seems that he likes his new job=He seems to like his new job. 主语从句。
第二句:as if 从句的作用,【注意】它在look, seem 等系动词后引导表语从句。如: She looks as if she were ten years younger. 她看起来好像年轻了十岁。 It seems as if our team is going to win. 看来我们队要胜了。
这就是你混淆的原因了!!!
【注意】在It seems/seemed as if...句型中,从句的谓语动词常用虚拟语气来表示所设想的事情不可能发生。例如:It seems as if she had read this novel.看来她好像看过这本小说。但如果句中的情况可能发生或可能被设想为真实,则仍然用陈述语气。例如:It seems as if our team is going to win.看来我们队要胜了。It seems as if he has learned by heart a speech written by someone else.看来他像是背了一篇由别人写的演讲稿
还有一点要提醒楼主:连接表语从句不可以用if,而用whether但as if例外。
as if 的用法在这个网站里
http://yy.dgzx.net/Article_Print.asp?ArticleID=112