as if (和as though用法相同，没有区别)
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. 看来我们队要胜了。
2. 引导方式状语从句。如：
She loves the boy as if she were his mother. 她爱这男孩，就好像她是他的母亲一样。 The child talked to us as if he were a grownup. 那孩子跟我们谈起话来，像个成年人似的。
