This teaching period mainly deals with the grammar£ºthe use of “it”£®The impersonal pronoun “it” is used frequently in English and has many different functions.“It” can be used in the subject or object position£¬to stand for an infinitive£¬£­ing form or a clause.The impersonal pronoun “it” can be used to talk about time£¬distance£¬weather£¬etc.“It” can also be used for emphasis.