Grammar, regardless of the country or the language, is the foundation for communication. When a message is relayed with the correct grammar, it is easier to understand the purpose and meaning of that message. In order to communicate, a learner should know the grammar of the language. It is important to be able to express your self, but this should be done in a way that people find easy to understand. 

Learn how to use 'should', 'ought to', 'supposed to' and 'had better' in this video lesson. You'll see what these verbs mean and how to use them.
We use the verbs 'should', 'ought to', 'supposed to' and 'had better' to say what you or other people think is the right thing to do.
That means these verbs express advice, opinion, criticism or (for 'had better'), warnings or threats.
'Should' and 'ought to' have the same meaning, although 'ought to' is much more formal and is not commonly used in spoken English.
'Supposed to' refers to what other people think is right, while 'should' expresses what you think is right.
'Had better' expresses the idea that something bad will happen if you don’t do what I say. This is why 'had better' can also be used to make threats or give someone a warning.

In this lesson, you'll learn more about:

- What 'should' means and how it compares to 'ought to', 'supposed to' and 'had better'.
- When you can/can't use 'ought to' instead of 'should'.
- The difference between 'should' and 'supposed to'.
- The meaning of 'had better' and how to use it.