和一般將來時一樣，只不過把助動詞be變為過去式，把will，shall變為過去式。

I didn't know if he would come.

=I didn't know if he was going to come.

我不知道他是否會來。

She was sixty-six. In three years，she would be sixty-nine.

她66歲了。三年后，她是69歲。

She told us that she would not go with us，if it rained.

她告訴我們，如果下雨，她就不和我們一起去了。

I didn't know how to do it. What would be their ideas?

我不知如何去做，他們會有什么想法呢?

2.過去將來時常可用來表示過去習慣性的動作。此時，不管什么人稱，一律用would。

This door wouldn't open.

這扇門老是打不開。

Whenever he had time，he would do some reading.

他一有時間，總是看書。

I would play with him when was a child.

當我還是孩童時，總是和他一起玩。

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