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选择性必修三《Unit 2 Healthy Lifestyle》Discovering useful structures优秀ppt课件
Period 3 Discovering useful structures
The infinitive of the verb used as the subject
Unit 2 Healthy Lifestyle
The Infinitive
(to do ……)
单元语法自我探究
Look at the following sentences and pay attention to the italicized infinitives. Find more infinitives in the reading passage, and tell their meanings and functions.
1. To change bad habits is never easy.
2. It took the surgeon three hours to finish my mother’s ling surgery.
3.To join the people’s Liberation Army, it is required for men to shave off their beards.
4. It was not polite to disturb your neighbors with loud music last night.
More infinitives in the reading passage
1….it can be easy for some of them to form bad habits.
2. After all, it is not easy to break bad habits.
动词不定式在句中做主语，有时为了保持句子的平衡，避免头重脚轻，常用it做形式主语，而真正地主语放在句子的末尾。比如第2；3；4例句。
Their meanings and functions
不定式的时态和语态：
不 定 式 主 动 被 动? 一 般 to write to be written? 进 行 to be writing ? 完 成 to have written to have been written? 完成进行 to have been writing?
4. It is important ______ Tom to get that job.