What Is Their Main Difference?
Modal Verb Should
Modal Verb Must
'Must' is also a modal verb. It is used to show necessities. It is also used to talk about likely events and to give suggestions. For example:
Talking about Possibilities
We use 'should' and 'must' to talk about possibilities and probabilities.
- 'Should' is used to talk about possibilities with a low chance of occurrence:
- 'Must' talks about possibilities that have a great chance of occurrence:
Negation and Question
Yes/no questions are made by putting the modal verbs at the beginning of the sentence followed by the subject and the main verb. For example:
Compare the following examples:
As you can see in the examples above, you cannot use these modal verbs interchangeably. The meaning will be changed significantly when we replace them. In the first example, 'should' lends a sense of suggestion to the sentence, while in the second example, 'must' lends a sense of obligation to the sentence. Here are more examples for clarification:
Talking about Necessities
We use 'must' to talk about obligations and necessities. These actions need to be done and are often related to law. We cannot use 'should' in this context since it conveys that the action is better to be done and there is no obligation in it. For instance:
'Should' has an informal nature. 'Must,' however, has a formal nature.
Conditionals Type 1
'Must' is used with the first type of conditionals. In this type of conditionals, we are talking about real situations and the results that follow them. These situations are considered to have a high chance of occurrence. For instance:
If you attend this class, you
If you want this job, you
Conditionals Type 2
We can use 'should' in the second type of conditionals that talk about hypothetical situations. These situations are imaginary and are considered to have a low chance of occurrence. For instance:
If you worked harder, you
If I had that much money, I
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