Lesson 3 and 4
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Modal Verbs Modal verbs are auxiliary verbs used to communicate obligations, necessity, advise, or suggestions. They are called "modal" verbs because they change the "mode" of a sentence — making it a command, a suggestion, or a necessity. |
Should is used to give advice, suggestions, or to talk about something that is a good idea or expected. It is used to express things that are recommended but not mandatory and is weaker than must.
- You should drink more water. (advice)
- She should get more sleep. (suggestion)
- I should study for the test tomorrow. (expectation)
► Affirmative
Example: He should eat vegetables.
► Negative
Example: You shouldn’t be late for class.
► Question
Example: Should I bring my homework tomorrow?
Must is used to express strong necessity or obligation. It means something is required and cannot be avoided. Must is stronger than should.
- You must wear a helmet when riding a bike. (obligation)
- I must finish my homework before I go out. (necessity)
- Students must respect their teachers. (rule)
► Affirmative
Example: She must wear a mask in the hospital.
► Negative
Example: You mustn't talk during the test.
► Question
Example: Must I submit this by tomorrow?
Need to express necessity or requirement, but it's a little less forceful than must. We use it to talk about something that is required or important.
- I need to finish my science project by Friday. (necessity)
- We need to clean the house before the guests arrive. (requirement)
- You don’t need to bring a gift to the party. (lack of necessity)
► Affirmative
Example: He needs to study for her exam.
► Negative
Example: You don’t need to bring lunch tomorrow.
► Question
Example: Do I need to buy a new dress for the event?
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Verb |
Use |
Example |
|
Should |
Advice, suggestion, expectation |
You should drink more water. |
|
Must |
Strong obligation, necessity |
You must finish your homework. |
|
Need to |
Necessity or requirement |
I need to leave now. |