如：Each cigarette a person smokes does some harm, and eventually he may get a serious disease from its effect.
It was during the 1920’s that the friendship between the two American writers Hemingway and Fitzgerald reached its highest point.
Our department was monitored by two supervisors, Bill and me.
2.that的指代作用
that指代不可數(shù)名詞和單數(shù)可數(shù)名詞(如是復(fù)數(shù)，用those)，后面通常跟有修飾語，如出現(xiàn)在比較結(jié)構(gòu)中的that of。如：
Conversation calls for a willingness to alternate the role of speaker with that of listener, and it calls for occasional “digestive pauses” by both.
No bread eaten by man is so sweet as that earned by his own labor.
3.one的指代作用
one指代帶不定冠詞的單數(shù)可數(shù)名詞m.gydjdsj.org.cn，復(fù)數(shù)為ones。the one 指代帶定冠詞的單數(shù)可數(shù)名詞。如：
A good writer is one who can express the commonplace in an uncommon way.
4.do的替代作用
do代替動詞，注意數(shù)和時態(tài)的變化。如：
For him to be re’elected, what is essential is not that his policy works, but that the public believe that it does.
