2+Unit+2+Must+Have+tio

= = = = == ==

=__ **Both express an obligation ,but** __=

= MUST __ **expresses an obligation imposed by the** speaker( ell s'ho exigeix a ell mateix, ho considera oportú) __= = HAVE TO __ expresses an external obligation, one imposed by external authority or external circumstances. __=

=I must clean my boots ,they are dirty ( personal Obligation, personal opinion ))= =You have to clean your own boots when you join the army( the army, external authority obliges you) =

=The boy has to practise the piano every day to enter the conservatorium(external obligation)= =I must study harder if I want to succeed(personal obligation, )= =I MUST work more rapidly .I want to finish at 6 and go to the disco.= =You have to dress well if you want to work in this enterprise(external obligation)=

=__MUST__= =__1)__ Affirmative __: Obligation__= = Negative: __expresses prohibition__= = Must + inf =

= Obligation = = I must work. She must study more if she wants to pass her test. =

= Prohibition = = You mustn't play here.It is dangerous = = Students must not eat chewing-gum in the class.!!!!!! = = Stephen, you must not come near the fire. You can get burned. =

=__2)HAVE T+ infinitive__= = = =__ Affirmative Expresses external obligation __= = __Affirmative__: Cars have to stop when traffic-lights are red. = = ......................Citizens have to obey the rules = = = =BE CAREFUL!!!!!!!!!!= =BECAREFUL!!!!!!!!!!!!!= =BE CAREFUL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!= =__ Negative and Interrogative: It is not necessary. Is it necessary __= = __Negative:__ I Don't have to study today( NO CAL QUE) =

= __Interrogative__: Do I have to bring money?(CAL QUE PORTI DINERS)? = = = = = =Remember:!!!!!!!!!!!!!!!!!!!!!!!!!=

=MUST HAS NO PAST TENSE AND NO INFINITIVE: You must use have to ( will have to, won't have to and had do,didn't have to )instead.= = = =She will have to do the work again because it wasn't perfect.= = ( will must is incorrect )= =Yesterday they had to get up early because they wanted to clean the house.= =**They** didn't have to **pay for the bus.(** didn't must is incorrect **)**=

=http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-49540.php= =http://www.better-english.com/grammar/mustnt.htm= = = =http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/330-modals-not1.htm= http://www.englishclub.com/grammar/verbs-modals-have-to-must-not-quiz.htm = = =http://www.englishclub.com/grammar/verbs-modals-have-to-must-not-quiz.htm= = = = =  [|exercise 1] = = > =[|exercise 2]= > > [|exercise 3] = = [|exercise 4] = = [|exercise 5]