tailieunhanh - Grammarway with answer 6

Grammarway with answer 6. Grammarway with answers is a series of four books for self-access study and/or classroom use. Grammarway with answers contains a full key to all the exercises and is an ideal supplement to any main coursebook of English language learning at secondary level. | UNIT 5 Modri The verbs must can could may might will would shall should and ought to are modal verbs. They express meanings such as obligation necessity certainty ability possibility lack of necessity offers suggestions requests logical assumptions permission prohibition advice and criticism. Modal verbs do not take an -s -Ing or -ed suffix . She must study. NOT She muoto otudy. are followed by a bare infinitive except for ought which is followed by a fo - infinitive. . He may be ill. NOT He may to be Hfr She ought to listen to you. go before the subject in questions and are followed by not in negations. . Can I talk to you He couldn t speak. do not usually have tenses. They can refer to the present or the future. . You can call now. present You can call tomorrow future 7lu si obligation - necessity - duty must It is your duty to do sth you are obliged to do sth You must stop when the traffic light is red. You are obliged to stop when the traffic light is red. prohibition mustn t can t It s forbidden to do sth you are not allowed to do sth It is against the rules law You mustn t can t park here. You are not allowed to park here. It s against the law. strong advice must I strongly advise you to do sth You really should behave yourself at school or you ll get into trouble. You must behave yourself at school. logical assumptions a positive logical assumptions must I am sure certain b For negative logical assumptions we usually use can t. a They must be the boy s parents. I m sure they are the boy s parents. b They can t be the boy s grandparents. I m sure they are not the boy s grandparents. Must can only be used to talk about the present or near future. We use have to when we need to use other tenses. . He had to work late yesterday so he didn t go to the party. present simple must have to past simple had to present perfect have has had to future simple must will have to must It Is necessary to do sth We use must when the speaker decides that something