OBLIGATION MUST AND TO HAVE TO

Must is a modal verb. It is used in the present or future. Must has no final s in the third person singular: You must, he must Must takes the bare infinitive: I must eat it up not I must to eat it up. To Have to is a verb with all tenses.It´s a normal verb like to read, to write, to paint.... She has to brush her teeth after the meals. They will have to wear uniforms next winter.

Must and Have to I have to do something: it is necessary to do it, I am obliged to do it, it´s a rule, it´s the law, it´s a general obligation. You have to take this medicine three times a day. I must do something: You think it is necessary to do something, you give your opinion, it´s your personal obligation. I must do the ironing-there´s a pile of clothes which need to be ironed.

Fill in the gaps:must or have to? She __________ wear gloves at work. She has to wear gloves at work.(it´s the rule in her job) I _________buy some milk-there isn´t any in the fridge. I must buy some milk-there isn´t any in the fridge.(my personal obligation) You can´t go straight on along Main Street. You _______ turn right. You can´t go straight on along Main Street. You have to turn right.( there´s a traffic sign) You can´t park outside the police station for nothing. You __________pay. You can´t park outside the police station for nothing. You have to pay. ( it´s the law) I eat too much pasta. I really __________stop. I eat too much pasta. I really must stop.( it´s my personal obligation.I think I´m getting fat)

STRONG RECOMMENDATION ADVICE MUST- TO HAVE TO- SHOULD/ SHOULDN´T- OUGHT TO /OUGHT NOT TO Strong recommendation: We use must and to have to. Yesterday I went to the cinema to see « Agora ». You have to see this film. It´s great. You must see this film. It´s nice Advice: We use should and ought to (and negative forms) Should is less stronger than must /to have to. You should do something=it´s a good thing to do, it´s the right thing to do. You shouldn´t do something=It´s not a good thing to do. We often use I think, I don´t think, Do you think... with should.Ex.: I think she should go home.It´s getting darker and darker or I think she ought to go home.

PROHIBITION MUSTN´T

It´s a negative imperative: Don´t… You mustn´t cross this line (Don´t cross this line) You mustn´t have your mobile phones on.(Don´t have your mobile phones on) (Don´t You mustn´t play the music so loud-your dad is sleeping right now. (Don´t play the music so loud) Mustn´t=can´t/ aren´t/isn´t allowed to In Dublin, you can´t smoke in any bars. In Spain, you aren´t allowed to smoke in public places. You mustn´t smoke on a plane. It isn´t permitted.

NO OBLIGATION LACK OF NECESSITY DON´T HAVE TO / NEEDN´T / DON´T NEED TO

It´s not necessary to do it You don´t have to come to class next Friday because we are taking it off. From 9 to 10 she doesn´t have to pay for the drinks. They are all free. I´m not working tomorrow so I don´t have to get up at 7. They needn´t pay ( They don´t need to pay)for the cinema. It´s free for all teenagers in summer holidays. We needn´t make up our minds now.(We don´t need to make up our minds now). We can decide a little bit later. Mary has got enough sugar for the cake so she doesn´t need to go shopping.

It was easy, wasn´t it? The end