that没有介词的词性。that可用作形容词、代词、连词、副词，还可用于固定搭配。that用作关系代词，引导限制性定语从句。先行词可人可物，用法相当于who或which，但是在下列情况下多用that，先行词既有人又有物时，先行词有形容词最高级、序数词、不定代词等修饰时，先行词是不定代词时。
that造句
That will add strength to your argument.
那会增加你的辩论的力量的。
I have heard that he has been married before.
我听说他过去结过婚。
The drawer is so tight that i cant open it.
这抽屉太紧，我打不开。
That was a very large and whiskered man.
那人身材魁伟，蓄着小胡子。
That country was drained of its resources.
