2．It is/was＋被强调部分＋that/who＋句子其他部分

　　It_is_human_activity_that (是人类活动) has caused this global warming rather than a random but natural phenomenon.

　　3．even if引导让步状语从句

　　Even_if (即使) we start reducing the amount of carbon dioxide and other greenhouse gases, the climate is going to keep on warming for decades or centuries.

　　4．as/so long as引导的条件状语从句

　　It is OK to leave an electrical appliance on so_long_as (只要) you are using it — if not, turn it off!

　　5．It takes ... to do sth. 需要(时间、精力等)做某事

　　It_takes_a_lot_of_energy (需要大量能源) to make things from new materials, so, if you can, buy things made from recycled materials.

　　Ⅳ.语法自测——it的用法(2)

　　完成句子

　　1．It_is_only_if/when_you_realize/It_is_only_by_realizing the mistake that you will be able to find a solution to it.(realize)

　　只有意识到这个错误，你才能找到解决它的方法。

　　2．It was not_until_she_(had)_arrived_home_that she remembered the appointment with her doctor.(arrive)

　　直到她回到家才想起了和医生的预约。

　　3．It is your efforts, not your intelligence, that_contribute_to your success.(contribute)

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