Is it because modal verbs don't change their form, but " have to" does?

是不是因为态动词不改变自身形式，但是 “have to” 会改变？

When making suggestions, modal verbs can be very useful.

做建议时态动词非常有用。

So you already know I'm sure about superlatives and modals of necessity.

你已经知道「最」「态动词」的重要性。

Can is a modal verb with many uses.

Can 是一个有许用法的态动词。

But why is " have to" different from other modal verbs?

但是为什么 “have to” 态动词不一样呢？

I tried to teach something about modal verbs.

我试着教了们一些关于态动词的内容。

Look for modal verbs like 'could', 'might' or 'must'.

寻找像“可能”、“也许”或者“一定”这种态动词。

We often use the words 'maybe' and 'perhaps' without a modal to express uncertainty.

我们经常用maybeperhaps而不是态动词表达不确定性。

You were right to question the use of two modal verbs together.

你对两个态动词的用法提出质疑是对的。

But again, " maybe" is an adverb, not a modal.

但是，" maybe" 是一个副词，不是态词。

For this usage, the word " may" is a modal verb.

在这种用法中，单词" may" 是态动词。

We'll start using more phrasal verbs, modal verbs, contractions, some idioms.

我们会开始测试更的短语动词、态动词、缩写，还有一些习语。

You may remember that the verb " should" is a modal verb.

你可能还记得动词" should" 是态动词。

The modal verb needs to be in the question tag!

态动词需要出现在反义疑问中。

These days we are more likely to use modal verbs such as 'should' or 'would'.

现在我们更的时候是用态动词shouldwould。

Why don't we cover the modal " WOULD" to make requests?

我们为什么不谈谈态动词 WOULD 用做表示请求的用法呢？

No, why? Because that's a modal verb.

不用，为什么？因为有个态动词。

But let's use " should" , that's our modal verb, before the subject.

但让我们在主语前用态动词 should。

Modals are added to another verb to show capability or possibility or necessity as well.

态动词被添加到另一个动词前面来表示能力或可能性或必要性。

Now it's important to consider modals, when it comes to the first conditional.

当说到第一类条件句时，考虑态动词很重要。