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kely、 probable、impossible等。 It is a long way to the school. ( 7)作形式主語。 —What’s this? —It’s a knife. —Whose watch is that? —It’s mine. ( 3)起指示代詞的作用,指一個人或事物。 The train has arrived. It arrived half an hour ago. ( 2)用以代替提示代詞 this, that。 —What time is it? —It’s eight o’clock. It often rains in summer here. ( 6)指距離 。 It was Xiaoming whom ( that )I met in the street last night. It was in the street that I met Xiaoming last night. It ws last night that I met Xiaoming in the street. It was I who met Xiaoming in the street last night. 含有“ It is …” 的句型 ( 1) It is time (for sb.) to do sth. It is (high) time that sb. did sth.(虛擬語氣 ) ( 2) It is + 形容