Unit 4 Global warming It的用法及强调句型 参考课件（共26张PPT）

例 句 代 词

用作人称代词，代替上文提到的人或事物。

— Who is it — It’s me. You've helped me a lot; I'll never forget it. 性质

功 能

例 句 代 词

用以代替指示代词this或that。

— What’s this — It’s a computer． — Whose book is that — It's hers． 性质

功 能

例 句 代 词

表示时间、天气、距离、价钱等。

It’s time for lunch． It’s raining hard． It’s two miles from the school to our home． 引 导 词

作形式主语, 代替由不定式、动名词或从句等表示的真正主语。

It is easy to buy a new radio. It is no use telling him that. It doesn't matter whether she comes or not. 引导词

作形式宾语, 代替由不定式、动名词或从句等表示的真正宾语。

I feel it my duty to help him. We thought it no use doing that. I’ve made it clear that nobody is allowed to smoke here. 引 导 词

表示强调,其结构是: It is/was+

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