江苏省睢宁县菁华中学高中英语“四步教学法”教案：M3 Unit2 Language Grammar and usage （2） （牛津译林版必修3）

教学程序设计

环节一   明标自学

过程设计

teaching objectives:

1 to master the usage of the preparatory subject it

2 to apply the usage of present perfect continuous tense into practical exercises.

step1. lead in

show the structure of this class to the students. and teach what the preparatory subject it  is .

it’s necessary for the young to master two foreign language.

it’s a waste of time talking to her any more.

it’s a pity that you missed the exciting football match.

it 作为形式主语的用法

当 不定式、动名词、从句  等用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语it.