介词短语 = 介词+名词性质的词
They are from China.
介词和介词短语的区别：
介词是一种虚词，不可单独做成分，后面要加名词性质的词，从而构成介词短语。
介词短语可以做表语、补语、状语等。
例：
1.介词+名词：
1）I'm on a diet.
2）He is at work.
3）She is in white.
4）Our house is on fire.
5）The road is under construction.
2.介词+代词：
1）Tommy is with her.
2）This is for you.
3.介词+动名词：
That's for stealing my money.
"to"什么是介词？什么时候是不定式的标志？
不定式：to do... 即to+动词原形
My goal is to make a lot of money.
介词短语：to+名词性质的词：
To victory.
To her.
To getting successful.
多种多样的介词：
1）简单介词：
in , on , by , for , at , about , under , of ...
2）合成介词：
into , within , throughout , inside , outside , without ...
3）短语介词：
according to , because of , in addition to , in front of , in spite of ...
4）分词介词：
considering , regarding ...
作业：
翻译：
1.他们在学校。
They are at school.
2.猫在桌子底下。
Cat is under the desk.
3.她穿着红色衣服。
She is in red.
4.这个礼物是给你的。
This gift is for you.