1
00:00:10,160 --> 00:00:15,439
Good morning everyone. In this video we are going to learn about modal verbs.

2
00:00:16,239 --> 00:00:22,699
Should, must and have to are three modal verbs of obligation.

3
00:00:23,719 --> 00:00:34,789
We use have to, must and should to talk about obligation, things that are necessary to do

4
00:00:34,789 --> 00:00:38,689
or give advice about things that are a good idea to do.

5
00:00:38,689 --> 00:00:46,689
We use have to when there is a rule so it is necessary to do something.

6
00:00:46,689 --> 00:00:54,689
Here you have some examples. You have to pass a writing test to get a driving license.

7
00:00:54,689 --> 00:00:57,689
You have to show your ID at the airport.

8
00:00:57,689 --> 00:01:03,689
These two examples express a strong and stern obligation

9
00:01:03,689 --> 00:01:09,629
because if you don't show your ID at the airport, you are not allowed to travel.

10
00:01:11,030 --> 00:01:13,049
The next one is must.

11
00:01:13,769 --> 00:01:21,489
Must is used when the speaker, the person that is talking, thinks it is necessary to do something.

12
00:01:22,510 --> 00:01:27,689
Must is used for personal obligation or moral obligation.

13
00:01:28,469 --> 00:01:29,769
You must tell the truth.

14
00:01:29,769 --> 00:01:32,650
We must go to the supermarket today.

15
00:01:32,650 --> 00:01:38,549
the fridge is empty so now we have to pay attention to the big difference

16
00:01:38,549 --> 00:01:43,989
between have to and must as I told you at the beginning both of them express

17
00:01:43,989 --> 00:01:51,370
obligation but this one is stronger we cannot decide to do this one or not when

18
00:01:51,370 --> 00:01:56,709
we are talking about have to it's because we have an strong and external

19
00:01:56,709 --> 00:02:03,590
obligation okay for example when we are talking about the law or different rules for example

20
00:02:03,590 --> 00:02:11,310
in spain we have to drive on the right we cannot take the car and then right on the left

21
00:02:11,310 --> 00:02:20,389
but must is weaker is not as strong as have to that is why must is used when we are talking about

22
00:02:20,389 --> 00:02:30,259
moral or personal obligation. And then should is used when the speaker gives a recommendation

23
00:02:30,259 --> 00:02:38,340
or a piece of advice, something that the person who is talking thinks is good or bad to do.

24
00:02:39,180 --> 00:02:47,280
I think you should buy the red t-shirt. You should eat more fruit. This person that is talking

25
00:02:47,280 --> 00:02:55,400
is giving an advice. So, in conclusion, when we are talking about obligation, we can use these

26
00:02:55,400 --> 00:03:03,300
three modal verbs, have to, must and should. Remember that have to is used when we are talking

27
00:03:03,300 --> 00:03:11,960
about external and strong obligations such as rules. Must, it's also used to talk about

28
00:03:11,960 --> 00:03:18,259
application but they are not as strong. Here the speaker, the person who is

29
00:03:18,259 --> 00:03:24,740
talking, thinks that something it is necessary and should is used to talk

30
00:03:24,740 --> 00:03:28,460
about advices.