40 Verbi modali e loro sostituti per obbligo, mancanza di obbligo e necessit Modal and non-modal verbs for duty, lack of duty, and need accordo assenza ausiliari divieto fare forma base infinito necessit nome non past simple principale regola soggettivo tutti FORMA I verbi modali can e must, (presenti) ....................................... prendono la -s della terza persona singolare del present simple, fungono da ....................................... per la forma negativa e interrogativa, e sono seguiti da un verbo alla forma base He must go. He must not go. Must he go? I verbi non modali: have to e be to, be obliged/forced/compelled seguono rispettivamente la coniugazione di have e di be He has to go. He does not have to go. Does he have to go? He was forced to go. He wasn t forced to go. Was he forced to go? sono seguiti da un verbo all ....................................... She had to stay (stay). Il verbo semi-modale need sia modale che principale: al present simple: affermativo , in genere, verbo ....................................... e si costruisce soggetto + need/needs + ....................................... /infinito I need a pair of trainers. She always needs to have a nap after lunch. negativo e interrogativo pu essere: modale: soggetto + need + not + ....................................... I need not/needn t think it over. ? need + soggetto + forma base (formale) Need you go to the supermarket? principale: soggetto + do/does + not + need + infinito I don t need to think it over again. ? do/does+ soggetto + need + infinito Do you need to go to the market? al ......................................., needed, verbo principale e si costruisce: + soggetto + needed + nome/infinito We needed some bread / to buy some bread. soggetto + did not need + nome/infinito We didn t need any bread / to buy any bread. ? did + soggetto + need + nome/infinito 108 Did we need any bread / to buy any bread? Verbi modali e loro sostituti per obbligo,mancanza di obbligo e necessit