Maybe you noticed this structure is called the causative.

也许你注意到这个结构被称为役。

The causative verb or the other verb?

役动词还是另一个动词？

It's the causative verb that takes the tense.

用时态是役动词。

There are more than 10 causative verbs in English.

英语中有 10 多个役动词。

No causative studies has ever shown artificial sweeteners causing weight gain.

没有任研究表明人造甜味剂会导致体重增加。

Right, let's get started with the causative verbs.

好，我们开始讲解役动词。

It's about the causative verbs 'have' and 'get'.

内容关于役动词 have 和 get。

However, in about 40% to 25% of the cases the causative genes are still unknown.

但是，有40％至25％致基因仍然未知。

In this lesson, we're looking at causative verbs.

本节，我们要学习役动词。

Now you know the meanings of the three most common causative verbs.

现在你知道了三个最常见役动词意思了。

We are going to be talking about causative verbs, in particular, have, make, get, help and let.

我们将讨论释义动词，特别是 have，make，get，help 和 let。

As I said before, we're looking at five verbs that we use with causative structures.

就像我之前说那样，我们要学习五个用役结构动词。

When we want to talk about that, we use causative verbs.

当我们想谈论这个问题时，我们用役动词。

Now there are two ways that we can use have as a causative verb.

我们用 have 作为役动词有两种方式。

Last week we looked at the meanings of three common causative verbs.

上周我们学习了三个常见役动词意思。

Some are in the causative structure; some are not in the causative structure.

有些在役结构中；有些不在役结构中。

There's the causative verb, then the person who does the action, and then the action.

首先是役动词，然后是做动作人，最后是动作。

Let's look now at causative make and let.

现在让我们看看因果关系 make and let。

This causative verb is used to say that we forced someone or something to do something.

这个役动词被用来说我们强迫某人或某事做某事。

While adenovirus is a possible hypothesis, investigations are ongoing for the causative agent.

虽然腺毒是一种可能假设， 但正在对原体进行调查。