摘要:3.做虚主语.没有实际意义.指天气.时间.温度.距离.潮汐.环境.现状等. 如: It’s hot. It’s eight o’clock. It’s raining. It’s noisy outside. 另外可以和since连用: It’s three years since we last met in Tianjin. It was long since they had visited that computer factory. 与say连用: It says there was a big fire in Hove. 听说霍夫有一场大火. 与take连用: It takes us half an hour to get to the railway station. 此外还有:It doesn’t matter. It is no use.

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