[ Modal Verbs ]
It isn’t necessary for you to worry about these trivial things.
A. You may worry about these trivial things.
B. You needn’t worry about these trivial things.
C. You shouldn’t worry about these trivial things.
D. You must worry about these trivial things.

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Grammar › ViewThe teacher asked, “Who did the homework?”
A. The teacher asked who did the homework.
B. The teacher asked that who did the homework.
C. The teacher asked who had done the homework.
D. The teacher asked who had did the homework.
Modals › View
DON’T HAVE TO represents…………….
A. lack of obligation
B. obligation