Tham khảo tài liệu 'english_rules_practice_3_split_8', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http 1 We use should ought to and had better with an infinitive . be go ask wait I should You ought to We had better INFINITIVE go-ask. wait. 2 We use both should and ought to to ask for or to give advice to say what is the correct or best thing to do A I ve got toothache. What should I do What is the best thing for me to do B You should go to the dentist s. The best thing for you to do is to go to the dentist s. When we are talking about a duty or a law we usually use ought to A I saw a robbery what should I do B You ought to report it to the police. It is a person s duty to report it. On the other hand when we are giving a personal opinion we use should B I think you should forget about it. We use should much more than ought to in negatives and questions I shouldn t go. or I ought not to go. Should I go or Ought I to go 3 We can also use had better to give advice to say what is the best thing to do There ll be a lot of traffic tomorrow. We had or We d better leave early. I had or I d better ask the doctor about the pain in my stomach. Note that had is a past form but it does not refer to past time here we use it to talk about present or future time. We only use had better to give advice about a particular thing when we give general advice we use should or ought to When people are in trouble they should go to the police. Not they had better go-to the police. The negative is had better not They had better not be late. Practice A Put in the right form of the verbs in the box. start tell have listen try wait 0 They ought to tell the manager about this problem. 1 Should we to phone them again 2 They had better the work at once. 3 We shouldn t to what they say. 4 It s a bit windy. We d better lunch here in the house not outside in the garden. 5 We ought until the police arrive. B Make these sentences negative by putting not in the right place. 0 Henry should stay in bed. Henry shouldn t stay in bed .
