句型9

It was + 时间段+before…."过了多久才(怎么样)……"

It was not long before…."不久，就……"

It will (not) be +时间段+before…."要过多久(不久)……才……"(before从句谓语动词要用一般时态)

[例句]

It was not long before he sensed the danger of the position.不久他就意识到他处境的危险。

It was five days before he came back. 五天后他才回来。

It will be half a year before you graduate from the school. 再过半年你才能毕业。

It will not be long before they understand each other. 他们大概不久就会互相了解。

句型10

in case of…(+n.) "以防;万一";

in case that…"以防，万一……"(谓语动词用一般现在时态或should+动词原形)

[例句]

In case of fire, what should we do?

Please remind me about it in case I forget/should forget. 万一我忘了，请提醒我。

In case (that) John comes/should come, please tell him to wait.

Please take your umbrella in case (that it rains/should rain).带上雨伞，以防下雨。