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。7) What he did has added to our difficulties. 他的所作所為增加了我們的困難。8) His ine adds up to $1000 a month. 他每月的收入共計1000美元。9) It’s no pleasure looking through these any longer because nature is one thing that really must be experienced. 觀看這些已不再是樂趣,因為大自然是你必須體驗的。10) Why is she so concerned about his attitude to her work? 她為什么那么關注他對她的工作的看法?have to/not have to, can/can’t, ought to/ought not to uses 用法:have to 用來表示義務責任,You have to pass your test before you can drive.Don’t have to 表達不必:We don’t have to wear uniforms at our school.Can 用來表示允許或請求許可或者表示某事可能發(fā)生。You can buy CDs at the market.Can’t 表示禁止或不可能:You can’t go out tonight.Ought to 表示應該做某事。You oug