It will be hours before he arrives at the bus stop.
他到车站得好几个小时。
It was not five hours before Tom left for Shanghai.
不到五个小时汤姆就去上海了。
注意:常出现在 before 前面的词或短语有: long, not long, years, months, days, hours, minutes 等。其肯定式表示过多久就 / 才,否定式表示不久就 / 才。
五 . It is / was / will be + the first / second time + that 从句。该句式意为这 / 那是第几次做。注意:如果主句谓语动词为一般现在时和一般将来时,则从句谓语动词为现在完成时;如果主句谓语动词的时态是一般过去时,则从句谓语动词的时态为过去完成时。例如:
It is the second time that I have been late for school.
这是我第二次上学迟到了。
It was the third time that I had been to Shanghai.
那是我第三次去上海了。
六 . 形式主语 it 可在下列情况下用来代替动词不定式:
1. It is + adj. ( +for sb. / sth. ) +to do sth. 常用于此句式的形容词有: easy, hard, difficult, possible, impossible, important, necessary, good, bad, exciting, interesting, surprising 等。例如:
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