八年级上册英语复习要点：第六单元语词辨析

　　1 promise vt. 保证，许诺。有三种结构：

　　1)promise to do sth. _____My mother promised to buy a piano for me.

　　2)promise sb. sth. _____ My aunt promised me a bike.

　　3)promise + that 从句_____ Tom promises that he can return on time.

　　promise n. 允诺， 诺言

　　Lily is a dishonest girl. She never keeps a promise.

　　2.when 与 while 的区别：

　　when 表示“当…时候”，既指时间点，又指一段时间，when 引导的时间状语从句中的动词可以是终止性的也可以是延续性的。When the teacher came in, the students were talking.

　　When she arrives, I’ll call you.

　　while 表示“当…时候”，仅指一段时间，从句中的动作必须是延续性的，一般强调主从句的动作同时发生， while 还可以作并列连词，意为“ 而、却”，表示对比关系。

　　Lisa was singing while her mother was playing piano.

　　Tom is strong while his younger brother is week.

　　3. practice vt. 练习， 后接名词，代词或v-ing 作宾语。

　　Your elder sister is practicing the guitar in the room.

　　常跟v-ing 作宾语的动词有：

　　考虑建议盼原谅：consider, suggest/advise, look forward to, excuse, pardon.

　　承认推迟没得想： admit, delay/put off, fancy.

　　避免错过继续练：avoid, miss, keep/keep on, practice.

　　否认完成能欣赏： deny, finish, enjoy, appreciate.

　　不禁介意与逃亡： can’t help , mind, escape.

　　不准冒险凭想象： forbid, risk, imagine.

　　4. everyday 与 every day 区别

　　everyday adj. 每天的 在句中作定语，位于名词前。 This is our everyday homework.

　　every day 副词短语， 在句中作状语，位于句首或句末。 He reads books every day.