1、其实在美式英语中，as if 会经常用like代替。
比如：
It looks like it's going to rain.
2、用法N2
在使用实义动词时，主语一般都是人。
例句：
I felt some tickets in my bag.
3、感官动词用作实义动词，常常会出现一些不完全的及物动词。
比如：
I heard her sing.
形成一种结构：
感官动词+宾语+宾补，这种宾补可以是原形或者分词。
4、我们对下面一组例子进行分析：I heard her sing
I saw him work in the park.
这里强调的是事件本身。
5、而下面这一组例子：I heard her singing.
I saw him working in the park.
这组例子强调的是看到他们的动作。
6、在被动语态中，常常要用不定式或者现在分词作补足语。
比如：
She was heard to sing.
She was heard singing.
前者强调事实，后者强调正在发生
7、我们以题目作为结束。
They know her very well. They had seen her _____ up frim a kid.
A. grow
B. to grow
C. was growing
D. grew
