MUST: It is necessary to do something. I must put the rubbish out.It smells awful.
MUSTN’T: It is not necessary to do something or it the wrong thing to do. You mustn’t feed the animal at the zoo.
FILL IN THE BLANKS WITH “MUST” or “MUSTN’T” 1.You …………… cross the stree when the traffic lights are red. 2.We ………… leave right now.We are going to be late for school. 3.Susan has got a very important exam tomorrow.She ………… watch TV. 4.The students ………….. run in the corridors.They might fall. 5.You …………. go out without your coat.It is freezing outside. 6.We ………….. protect the animals and environment. 7.If you want to go to university,you ……………. study regularly. 8.We ………….. obey the traffic rules.It is very important for our safety. 9.People ………….. cut down trees if they don’t want to increase global warming. 10.Students ………… cheat in the exam.It is nothing but theft. 11.People ………… be polite to each other and shouldn’t hurt each other’s feelings. 12.You ………….. buy those tomatoes.They are rotten. 13.We …………. buy some flour and a few eggs.We will make a cake but we haven’t got any flour and eggs. 14.You …………… park here.It is forbidden to park here.
NEEDN’T: It is not necessary to do it,you don’t need to do it. You needn’t buy a new pencil.I will give you one.
FILL IN THE BLANKS WITH “MUSTN’T” or “NEEDN’T” 1.You ……………. buy any more bread.We have got plenty. 2.I have studied for the exam for more than six hours and I understood every detail.I …………. study more. 3.Jack has just painted the bench.You ………….. sit on it. 4.We ………… speak loudly in the library.Other people might be disturbed. 5.You …………. bring any food for the party.We have got enough food. 6.You …………. eat or drink in the classroom.The teacher might be angry. 7.We …………… buy any CDs.We haven’t got a CD player. 8.George …………… eat fast food.He is very fat and fast food is unhealthy. 9.The students …………. bring their books today because they are going to visit the museum. 10.People …………… throw litter on the floor. 11.We ………….. shout at each other when we are discussing something.It is very rude. 12.Jack …………… buy another car because he has got three already. 13.You …………. go near that dog.It might bite you. 14.We …………… buy that book.Peter has got the same book,so he can lend it to us.
FILL IN THE BLANKS WITH “MUST” “MUSTN’T” or “NEEDN’T” 1.People ……………… save the tuna fish,otherwise they will be extinct in the future. 2.We ………………… kill the seals.We ……………. protect them.They are very lovely animals and they have a right to live as we do. 3.You …………… put the pizza in the refridgerator.It is already gone off.Just put it in the bin. 4.The students …………….be careful reading the questions.Most of the wrong answers are due to misunderstandings. 5.You …………. buy any tickets for the match.I have got two and I will give one of them to you. www.englishwsheets.com