Which sentence is incorrect? A. Teachers need to plan ...

★ Modals for Advice, Obligation/Prohibition, Necessity and Lack of Necessity

Which sentence is incorrect?

A. Teachers need to plan their lessons.

B. Teachers have to correct homework.

C. Teachers don’t need to wear a uniform.

D. Teachers don’t have to hit their students.

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Which sentence is correct?

A. Last month, the organisers must cancel the competition.

B. You must to send in your new competition entries by 14th July.

C. You must include your name, address and age.

D. Winners will must accept the final decision of the organisers.