When do we use the modal verb "must"?
When do we use the modal verb " should "?

1. Must is used to express obligation, give orders and give advice. It can only be used for present and future reference. When the past is involved, you use have to.

2. "Should" is a modal verb most commonly used to make recommendations or give advice. It can also be used to express obligation as well as expectation.

Explanation:

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UNLIKELYGO UNLIKELYGO · Answer 2

When you hear sentences using these two simple modals, they sound quite the same right?

Should is the past tense of shall. You should speak Filipino daily. So, here I am advising you to speak Filipino daily. It means you must use "Should" when you are giving advice or suggestions or you talk about something right or wrong. For example, you should quit smoking.

Coming to the Modal verb, Must. It is used to talk about a necessity or an obligation. For example, you must sleep early. This means you must sleep early otherwise it may affect your health. So, there is a consequence when you use "Must". Another example could be - You must help me.