Basic English : Use of a Modal ' Must'

Use of 'Must'
Use : 1 - Must show - Compulsion,order, obligation,rule,law...

eg. You must do this work today.
eg. I order you that you must do it.

Use : 2 - Must be - Assume

eg. He must be your brother.

Use : 3 - Difference between Should and must
Should: suggest - in a casual way
Must: suggest - so important

eg. you seem ill, you must/should consult a doctor. ( here we choose - must )
eg. your friend should/must wash his car as it looks dirty. ( here we choose - should)
eg. you should/must go there. ( we can choose both must and should)

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