定語從句中that什麼情況省略？
如果關係代詞that在從句中做賓語，就可以省略。
如：the flowers （that） I bought yesterday....
that指代flowers，在從句中做bought的賓語，就可以省略。
做主語的話就不能省。如：All that glitters is not gold. 發光的不都是金子。
that在從句中做glitter的主語，所以不能省。
that的用法
1．用作代詞，代替前面所指的事物，常見於表示比較關係的狀語從句中，例如：
It is warmer in the south than ( that of )the south.
2．引導名詞性從句作賓語，即賓語從句，例如：
She said ( that ) she would come. I suggested ( that )we ( should ) go home. 3．作關係代詞，在定語從句中作表語或賓語，例如：
Can I have the records ( that ) I lent you? He is just the man ( that ) you talked about.
4．在 way （意為 manner ）後面，that 意思為 in which，例如：
Do it the way ( that ) I showed you.
5．在表示個人對事物反應、表示重要性或迫切性的後所接的從句中，例如：
I am glad ( that ) you are right. It is obvious ( that ) they are happy together.
6．so that, so…that, such…that, 結構中，例如：
I came to see you so ( that ) you would know the truth. She had so many children ( that ) she didn’t know what to do. I was having such a nice time ( that ) I didn’t to leave.
7．用於表示時間的詞後面，整個短語相當於when，例如：
I joined the army the year/month ( that ) my father died. Mac came to see me the week ( that ) we went camping. The time ( that ) you knocked at the door, my telephone rang. I thought her nice and honest the first time ( that ) I met her. = I though her nice and honest when I met her.
8．如果定語從句中的謂語是 there is，作主語的關係代詞 that 也常省略，例如： This is the fastest train ( that ) there is to Beijing.
