The plan （was given） up bacause of rain. 计划被放弃了是因为雨的缘故.计划是被人放弃的,要用被动.

Where is Tom?He （has gone）to the post office. Tom在哪儿?他已经去邮局了.问句是进行时,Tom现在在邮局, has gone：去了没回来.

She (didn't go) to bed until she (finished) herwork.常见语句涉及until

Where （will）we (meet)?” “Let’s meet outside thepark gate. 进行时的对话.

I （am） afraid Mr Johnson(won‘t visit) outschool tomorrow.tomorrow：将来 我害怕johnson先生明天不来我们的学校.

When we reached the town, it (got) dark.
We (were having) lunch when suddenly someone knocked at the door.吃午饭是延续动词,要用进行时.
They(have been) to that small village several times.have been to现在完成 已经去过几次了.

It (is getting) dark. What about (going) home at once? 天色正在变暗.what about是提示词,表建议,说明这句是现在时. what about/how about+doing sth.