Name: 常見的錯誤｜"必須 "和 "不得不"｜自信地說英語（EZEE #5）。 (Common mistakes | 'must' & 'have to' | Speak English with confidence (EZEE #5))
Uploaded: 2021-01-14T10:01:23.000Z
Duration: 14 min 14 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

Welcome to listen five in my Easy Siri's.

If you have watched any of the 1st 4 lessons, you will know that this series is about building your confidence to use English by discovering the common mistakes that most learners of English tend to make and then learning to correct them yourself.

I hope that as you watch more and more off my easy lessons, you begin to accept your errors as a natural part of the learning process and relax about them and also begin to feel great about your growing ability to catch and correct your own mistakes Before we begin.

Just a quick note to say that in this year's January sale, we're offering 30% discount on all membership levels off my complete online self study English course.

You can find the coupon code in the description box.

Okay, in this lesson, we're going to continue the topic of less and fall, which is the verb Haft and listen for.

We learned how to congregate, have to correctly in different tenses in this lesson will deal with the common mistake off treating have to and must as synonyms which is sometimes okay, but not always.

So let's look at when you can use them a synonyms and when you can't his it was up.

English errors Less than five must or have to.

They don't express the same idea, but similar ideas.

One expresses an external obligation, a rule.

The other one expresses a strong necessity felt by the speaker.

Which one expresses an external obligation?

For example, according to my contract, I have to be at work by 8 a.m. That means that a strong necessity is expressed by must.

To avoid the rush hour traffic, I must leave home by 7 a.m. But this distinction is vague and often ignored, so you can use the two interchangeably you can also use need to as an alternative to pose.

So that brings us to the next question, which is do muscles and don't have to also expressed similar ideas.

The other one expresses at Prohibition An obligation or a necessity not to do something.

Which one removes an obligation or a necessity?

For example, I'm on a flexi time contract.

I don't have to be at work by 8 a.m. We have removed the application here.

To avoid the Russia here we have removed the necessary.

So that means that in order to express an obligation or a necessity not to do something we use Mustn't.

For example, my contract says that I mustn't arrive any later than 8 a.m. Huh?

I mustn't leave home any later than seven.

And the final question I'd like you to think about his doom.

Us don't have to follow the same grammar rules.

No, As you will remember from my easy for lesson one off them is a motive.

Herb and the other one is an ordinary va.

Do you remember which one isn't ordinary verb correct?

Have to is an ordinary verb and, as an ordinary verb have to and don't have to can be used in any tense or structure, for example, had to We'll have to have had to should have to after a model Bob all in the negative.

Now need to is also an ordinary verb, so you can use it in exactly the same way as have to just a little note here that you may see need without two used as a motive up.

I'd recommend you always use meat, so if have to is the ordinary of up.

Now, as a motive, Herb must has only wonderful, and it can only express a necessity in the present or future to express a necessity in other tenses we use have to or need to.

So we can say every day I must Oh, tomorrow I must.

But yesterday you have to switch tohave to yesterday I had to or I need it too.

It can only express prohibits shin in the present or future to express prohibition in other tenses.

So if we have in the present today, we mustn't interrupt the speaker.

If you want to speak about yesterday, we can use the verb allow.

Yesterday we weren't allowed to interrupt the speaker and this would indicate an external obligation.

Oh, yesterday I didn't allow myself to interrupt the speaker.

This would be a self imposed internal prohibition.

Okay, let's do a quick summary before we do the very important exercises.

So first of all, although mustard have to express slightly different ideas, they're interchangeable.

So she must all she has to Oh, she needs to rest a necessity or an obligation to do something.

The difference is vague and not very important, but mustn't and don't have to or don't need to express completely different ideas.

For example, she's in, so she mustn't work here.

It's a necessity or an obligation not to do something.

Compare that with she is ill, but she doesn't have to or she doesn't need to see a doctor here.

There is no necessity or obligation to see the doctor.

And finally must is a mode over and have to is an ordinary verb.

If you're unsure about these, please watch my easy for lesson.

I'd like you to choose between must and half to to express the same idea and make sure you use the correct form, positive or negative.

And the correct tents, for example, say it will be an obligation for us to pay the bill.

We will have to pay the bill on obligation in the future.

Second example say it is necessary for us not to lose hope.

We mustn't lose hope and necessity not to do something in the present.