(
课件网) Grammar Focus-4c Unit 9 It’s important to have good habits. 情 境 导 入 I think it’s important for teenagers to … Presentation 观察下列句子的共同特点 1. To see is to believe . 2.To watch TV is boring . 3. I am surprised to watch him eat so quickly . 4.Edison’s mother taught him to read and write . 5. Don’t forget to wear a mask when you go out if you have caught a flu. 6.What I want is to learn from others. Presentation 思考不定式所作句子成分 1. To see is to believe . 2.To watch TV is boring . 3. I am surprised to watch him eat so quickly . 4.Edison’s mother taught him to read and write . 5. Don’t forget to wear a mask when you go out if you have caught a flu. 6.What I want is to learn from others. 7.I want something to drink . 动词不定式（ Infinitive ）是动词的一种非谓语形式，没有人称和数的变化，不能单独作句子的谓语。其构成形式为“ to ＋动词原形”, to 为动词不定式的符号，本身无意义。不定式可以在句子中用作主语、表语、宾语、宾语补足语、定语、状语等。 主语 主语 状语 宾语补足语 宾语 表语 定语 Presentation 不定式作主语 不定式作句子主语，谓语动词应用第三人称单数形式。 To see is to believe . To watch TV is boring . 不定式做主语常置于句末，而用 it 代替其做形式主语，避免句子头重脚轻 To do yoga (瑜伽)makes you healthier. To watch TV is boring . Presentation 不定式作宾语 We hope to get there before dark . 我们希望天黑前到达那儿。 拓展：常跟不定式作宾语的动词有 want , forget , refuse , need , try , learn , hope , wish , decide , begin , start 等。 决心 学会 有希望（ decide , learn , wish , hope ) 同意 计划 主动干（ agree , plan , offer ) 拒绝 要求 会失败（ refuse , demand , fail ) 想要 设法 来帮忙（ want , manage , help ) 请求 准备 负担起（ beg , prepare , afford ) 答应 安排 来期待（ promise , arrange , expect ) 以上后跟不定式，劝君牢记永不忘。 Presentation 不定式作宾语 注意： 当复合宾语中的宾语是动词不定式时，先用形式宾语 it 代替动词不定式把动词不定式置于宾语补足语之后， 即，主语＋动词＋ it ＋宾语补足语＋ to do sth. We think it important to learn a foreign language well ． 我们认为学好一门外语很重要 Presentation 不定式作宾语 注意： 当复合宾语中的宾语是动词不定式时，先用形式宾语 it 代替动词不定式把动词不定式置于宾语补足语之后， 即，主语＋动词＋ it ＋宾语补足语＋ to do sth. We think it important to learn a foreign language well ． 我们认为学好一门外语很重要 Presentation 不定式作表语 动词不定式常在连系动词 be 后作表语 The next step is to make sure that we have enough food. 下一步要确保我们有足做的食物。 e.g. The most important thing is _____ (learn)something new and have fun. to learn Presentation 不定式作宾语补足语 不定式作句子宾语补足语，放在宾语后面。tell , ask , want , order , teach , invite , wish , get , help 等词后面常接不定式作宾语补足语。 即 v .+ sb . to do sth . My parents will not allow me to play on the street． 我父母不允许我在街上玩耍。 e.g.My mother wants me _____ (do) the housework. to do Presentation 不定式作宾语补足语 拓展：后跟省略 to 的不定式作宾补的动词： 一“感”( fe ... ...
