it seems as if 和it seems that的区别

It seems that American fast food is the most popular in the worle.看来美国的快餐是世界上最受人欢迎的。在这个句子里It seems that…是一个固定句型，“看来，似乎是，好像”的意思。

例如：It seems that she is happy. 她似乎很高兴。

It seems that he likes his new job. 他看起来很喜欢他的新工作。

It seems that they don't like the idea. 他们似乎不喜欢这个主意。

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。例如：

American fast food seems to be the most popular in the world.

看来美国的快餐是世界上最受人欢迎的。She seems to be happy.

她似乎很高兴。He seems to like his new job.

他看起来很喜欢他的新工作。

They don't seem to like the idea. 他们似乎不喜欢这个主意。

as if 的用法在这个网站里http://yy.dgzx.net/Article_Print.asp?ArticleID=112
一、as if 从句的作用 1． 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