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CAN• We use can when we want to express possibility, ability ,permission and to make request.* Afirmative sentences : subject + can + verb in infinitive I can cook lentils because my grandmather taught me. * negative sentences: subject +can´t + verb in infinitive I can´t play rugby because I´m very dumb.* Interrogative sentences: can + subject + verb in infinitive Can I open the window ? It is very hot.
COULD*We use could when we want to express possibility, ability,permission and to make request in the past.*Afirmative sentences: subject+ could+ verb in infinitive Mike could ride his bike when he was six years old.*negative sentences: subject+ couldn´t + verb in infinitive. Shanon couldn´t go to the party because she had to study.*interrogative sentences: could+ subject+ verb in infinitive. Could Shanina cook and talk in the phone at the sametime?.
SHOULD* We use should to give advice* Afirmative sentences: subject+ should + verb in infinitive. You failed your exam so you should study harder.* Negative sentences: subject+ shouldn´t +verb in infinitive. you shouldn´t smoke because it´s bad for your lungs.* Interrogative sentences: should + subject + verb in infinitive.• I had an argument with my mum. What should I do?
MUST• We use must to express obligation.• Afirmative sentences: subject+ must+ verb in infinitive.• You must go to sleep at 10:00 .• Negative sentences: subject+ musn´t + verb in infinitive.• You musn´t smoke in this restaurant.
HAVE TO• we use have to to express obligation.• Afirmative sentences: subject+ have to + verb in infinitive.• You have to turn off your mobile phone in the mass.• Negative sentences: subject+ don´t /doesn´t have to+ verb in infinitive• You don´t have to cheat in the exams.• Interrogative sentences:do/ does + subject+ have to+ verb in infinitive• Do you have to send a message?
MAY AND MIGHT• We use may to show possibility in the future, to ask for and give or deny permission in a formal speech.• We use might to show possibility in the future .• Afirmative sentences: subject+ may/might+ verb in infinitive.• Dan may/might go shopping with his mum later today.• Negative sentences:subject+may /might not+ verb in infinitive• You may/might not use your phone in class.• Interrogative sentences: may + subject+ verb in infinitive.• May I go to the bathroom?.
EXERCISES• Choose the right modal verb• Its a hospital. You _______ smoke• I _____speak Arabic fluently when I was a child and we lived in Morocco• The teacher said we_____ read this book for our own pleasure as it is optional. But we______ read it if we dont want to. * Take an umbrella. It ______ rain later. * Drivers_______ stop when the traffic lights are red.* _____ I ask a question? Yes, of course.