一. be doing when ——正在做某事，这时...... I was doing my homework when the bell rang. 我正在写作业，这时候铃声响了。 The students were talking loudly when the teacher came in. 学生们正在大声说话，这时老师进来了。 二. be about to do when=be on the point of doing when——正要去做某事，这时...... I was about to go to bed when the phone rang. =I was on the point of going to bed when the phone rang.

We use when to ask questions, as a conjunction and to introduce relative clauses. We can use when to ask for information about what time something happens: When did you leave? When …

2011年11月14日 · At best, "for" is not necessary in either sentence. Some would say it's wrong. That's certainly true for sentence #1. But what about #2? When do you want to schedule the interview? Is the intended meaning clear? Can't this sentence be understood to mean "when do you want the scheduling to take place?"

Synonyms for WHEN: while, whilst, as, so long as, once, immediately, instantly, as soon as; Antonyms of WHEN: after, since, directly

when to do和 when doing的区别如下所示。 1. 释义区别： - "When to do"表示某件事情应该在何时完成或进行。 - "When doing"表示在进行某件事情的同时发生的其他情况或事件。 - When to do homework is up to you.（何时做作业由你决定。 - Be careful when doing experiments in the lab.（在实验室做实验时要小心。 2. 用法区别： - "When to do"常用于询问或讨论一个事件或任务应该何时完成。 - "When doing"常用于描述在进行某项活动时同时发生的事情。

We use when to refer to the time of a future situation or condition that we are certain of: … In informal language, we often use where, when or why to introduce defining relative clauses …

You can use "for when" when you are making a statement about something happening in the future. For example: I wrote down the address for when we need to return the rental car. For …

2023年10月26日 · In summary, the preposition “to” generally indicates direction or movement, while “for” generally indicates purpose or intended recipient. I went to the store to buy milk. It …

We use when to refer to the time of a future situation or condition that we are certain of: … In informal language, we often use where, when or why to introduce defining relative clauses …

2024年8月30日 · Our clocks will fall back at 2 a.m. on Sunday, Nov. 3, 2024. Will we gain or lose an hour when DST ends? When daylight saving time ends, we will set our clocks back an hour, which means we will be...