謂語動(dòng)詞的時(shí)態(tài)與時(shí)間狀語的時(shí)態(tài)一致； 　　
從句的謂語動(dòng)詞時(shí)態(tài)與主句保持一致； 　　
直接引語的時(shí)態(tài)和間接引語的時(shí)態(tài)轉(zhuǎn)換； 　　
例如： 　　
1) 如果從句所敘述的為真理或不變的事實(shí)，則永遠(yuǎn)用現(xiàn)在時(shí)。
At that time, people did not know that the earth moves. 　　
He told me last week that he is eighteen. 　　
2) 賓語從句中的助動(dòng)詞ought, need, must, dare 時(shí)態(tài)是不變的。 　　
He thought that I need not tell you the truth.

2. marry 與 married

關(guān)于marry的用法:
V.1) 與(某人)結(jié)婚,嫁或娶(某人)
They married when they were yong.
Jane is going to marry John.
2) 為(雙方)主持婚禮
They were married by her father, who's a bishop.
新娘的父親是主教,為他們主持了婚禮.
3) 使(某事物)與另事物結(jié)合
She marries wit and/ with scholarship in her writing.
她的寫作中融合了智慧和學(xué)識.

married adj.
1) 結(jié)婚的,已婚的.married to sb.
He's married to a famous writer.
2) married to sth.專心于某事物.

3. leave for: leave這個(gè)詞，唯一與for連用的意思是“離開某地去某地”。比如：

他昨天去了北京。He left for Beijing yesterday.
他昨天離開上海去了北京。 He left Shanghai for Beijing yesterday.