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ng. It’s a waste of time arguing about it. b. There’s no joking about such matters. There’s no saying what he’ll be doing next. There’s no telling what he’s going to do. 注 ② : 動名詞作主語 與 不定式作主語 的區(qū)別: 動名詞作主語通常表示抽象的或泛指的動作 , 一般不與特定的動作執(zhí)行者聯(lián)系在一起;不定式作主語通常表示具體的動作或行為 ,往往與特定的動作執(zhí)行者聯(lián)系在一起 , 如: It’s no use crying over spilt milk. (抽象 ) He realized that to go on like this was no use. (具體 ) 在實際運用中 , 一般可以互換 , 差異不大 。 he won’t be at home. It’s a waste of time arguing about it. It’s no good waiting here. Let’s walk home. 而在 It’s important … / It’s necessary … / It’s advisable … / It’s essential … / It’s fitting … 這類句型中 , 只能用不定式 , 如: It’s important to learn foreign languages. It’s quite necessary to read it many times. 2. 動名詞 ( 短語 ) 作表語 , 如: Their job is building houses. His job is raising pigs. 注 ① :動名詞作表語與不定式作表語的區(qū)別: 動名詞作表語時表示比較抽象的一般行為 、 習慣;不定式作表語時表示具體的某一次動作 , 特別是將來的動作 , 試比較: My favourite sport is swimming. The first thing for us to do is to improve our pronunciation. 注 ② : 動名詞作表語 與 現(xiàn)在分詞作表語 的區(qū)別: 動名詞作表語時相當于名詞 , 說明主語的含義及內(nèi)容 , 它與主語是同等關系 , 主語與表語互換位置不影響句子的基本含義 , 但不可用副詞來修飾 。 常見的有: insist on / think of / dream of / object to / hear of / prevent … from / keep … from / stop … from / feel like / be engaged in / look forward to / depend on / thank … for / excuse … for / devote … to / set about / spend … in / get (be) used to … / be fond of / be afraid of / be tired of / succeed in / be interested in / be proud of / burst out / give up 等 ,如: He insisted on seeing us home. They all objected to putting the meeting off. Are