1.有时用it代替小孩和婴儿。
Look at the baby, it has just fallen asleep.
看那个孩子,他刚睡着。
2.it作形式主语或形式宾语。
It is necessary to buy that dictionary.
有必要买下那本词典。(形式主语)
She found it easy to finish all the exercises.
她觉得做完所有的练习很容易。(形式宾语)
3.用作主语,表示时间、天气、和距离等。
It was cold all day yesterday.
昨天一整天都冷。(指天气)
It is nine o'clock.
九点了。(指时间)
It is about two hours' walk.
步行大约两个小时。(指距离)
4.打电话时用于指人。
“Hello, it is Jack”
"喂,我是杰克"
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