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ore he joined the army?My elder sister joined the Party last year.(2) join sb. (in …) 表示“和某人一起(做某事)” 同義:take part in 或be inWill you join us?He joined his wife in her study.Will you join us in a walk?May I join in the game? (join in sth.)take part in多用于參加某項(xiàng)活動(dòng)= May I take part in the game?(3) join為短暫性動(dòng)詞,其延續(xù)性動(dòng)詞為:be in …或be a member of …He joined the army two years ago.= He has been in the army for two years.= He has been a soldier since two years ago.(4) join in和take part in都可表示“參加活動(dòng)”但take part in更強(qiáng)調(diào)了參與性,特別是有眾多人參加的活動(dòng)Many other students took part in (joined in) the cleaning.Twenty students from our class took part in the sports meeting.“積極參加”可說take an active part in或join actively in7. (1) add “加,增加”短語結(jié)構(gòu):add … to … “把…加到…上,增加,添加”The tea is too strong, add some hot water.She added some sugar to her tea.The wonderful song added to our pleasure.If you add 3 to 7, you get 10.(2) add“補(bǔ)充說,又說,還說”I would like to add that we are pleased with the result.“And don’t be late,” she added.8. (1) mistake名詞“錯(cuò)誤”I made lots of spelling mistakes in last exam.I took your umbrella by mistake. (錯(cuò)拿)(2) mistake—mistook—mistaken動(dòng)詞“誤解,錯(cuò)認(rèn)”I mistook her for her sister.He has mistaken me.I mistook what she said.9. (1) discover 表示“發(fā)現(xiàn)”有時(shí)可與find互換, 但在表示原先客觀存在而不為人知的新發(fā)現(xiàn),特別是科學(xué)上的發(fā)現(xiàn)時(shí)只用discover.They discovered an oil field.(2) invent 是“發(fā)明”即創(chuàng)造原先沒有的東西(工具、手段、方法)Who invented the telephone?(3) look for 是“尋找”的動(dòng)作和過程.Are you still looking for your missing wallet?(4) find 是“尋找”的結(jié)果即“找到、發(fā)現(xiàn)”通常指偶然發(fā)現(xiàn).He can’t find his lost dictionary.(5) find out 指通過觀察、探索、調(diào)查出事物的真相“查明、弄清楚”Try to find out who was late for school this morning.10. (1) start = build / open 創(chuàng)辦,建立,成立He started / opened his own puter pany.(2) start 啟程,動(dòng)身He started / left for Shanghai yesterday.(3) start 機(jī)器啟動(dòng)運(yùn)轉(zhuǎn)Please show me how to start the puter.(4) start (名詞) = beginning endat the start / beginning of at the end of(5) start = begin to do sth. / doing sth.11. (1) also一般位于系動(dòng)詞、助動(dòng)詞、情態(tài)動(dòng)詞之后,行為動(dòng)詞之前,用于肯定句中He also plays football.The boy is also good at spoken English(英語口語).H