21. Want to + verb

Use want to + base verb to express a desire or intention.

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22. Need to + verb

Use need to + base verb to express necessity.

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23. Have to + verb

Use have to + base verb for obligation or necessity.

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24. Don't have to

Use don't have to when something is not necessary.

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25. Needn't / don't need to

Use don't need to for something that is unnecessary.

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26. Should + base verb

Use should to give advice or say what is a good idea.

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27. Shouldn't + base verb

Use shouldn't to advise against an action.

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28. Must + base verb

Use must for strong obligation or a strong conclusion.

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29. May / might for possibility

Use may or might + base verb when something is possible.

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30. Could for possibility

Use could + base verb to describe a possible situation.

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