For instance,even native speakers are often not sure when to use "lie" and when to use "lay."

VOA: special.2010.02.11

They like to--when they're computing the investment yield, they want to be completely honest and not use any rules of thumb.

当他们计算投资收益率的时候,他们需要完全精确,而非用经验公式

耶鲁公开课 - 金融市场课程节选

And you want to use it when you really, really do not like something

当你特别特别厌恶某事的时候，你才会用这个词。

I hate 课堂 - SpeakingMax英语口语达人

When they could not use hammers, they used dynamite.

VOA: special.2009.08.12

As I mentioned, you can also use "I wish" when you express something that you do not want to have happen.

就像我之前提到的，当你想说明你不希望发生的事情时，你也可以用“I wish”。

I wish 课堂 - SpeakingMax英语口语达人

But others, even when they know the risks, do not want to use condoms.

VOA: standard.2009.10.21

You can also use a "must" pattern when you're not talking about a person but you're talking about a situation.

当你不在谈论人物，而是在谈论情况的时候，你也可以用“must”句型。

Must 课堂 - SpeakingMax英语口语达人

President Obama did not use the word "democracy" when speaking about Afghanistan on Friday, although he spoke of such democratic principles as elections and human rights.

VOA: standard.2009.03.27

So you will use "it depends on" in a sentence when you're not sure of something is going to happen.

当你不确定某件事是否会发生时，你就可以使用“It depends on”句型。

It depends on 课堂 - SpeakingMax英语口语达人

When you don't produce enough insulin yourself, as diabetics do not, then you can use insulin as a drug.

如果你的体内不能产生足够的胰岛素,例如糖尿病人,你就可以将胰岛素作为药物使用

耶鲁公开课 - 生物医学工程探索课程节选

Now for the hacker edition, if you are feeling up to a bit more of a challenge you'll find that when you run the game, one it's not all that hard to use some ASCII art just make it a little fancier as the teaching fellow who implemented this solution did.

对于升级版，如果你能应付更大的,挑战，你会发现当你在玩这个游戏时，用一些字符画把它做得,比那些教学人员做的更有新意,并不是那么困难。

哈佛公开课 - 计算机科学课程节选

It's rather, "Can you imagine a world in which the very thing that you really are picking out when you refer to me by the name Shelly-- namely this thing-- can you imagine a world in which that thing exists, but the thing that you're picking up when you use the word Kagan does not exist?"

而是在于,你能不能想象在一个世界里,你用薛立这个名字,指的那个人,也就是这个东西,你能不能想象在一个世界里某个东西存在,而你用卡根这个词,所指的这个东西却不存在

耶鲁公开课 - 死亡课程节选

When to use "the" in a sentence, when not to use "the", when to use "an" instead of "a" or "a" instead of "the".

在一个句子中，什么时候用“the”，什么时候不用“the”，什么时候用“an”代替“a”，什么时候用“a”代替“the”。

经常犯的失误 - SpeakingMax英语口语达人