Tham khảo tài liệu 'understanding and using english grammar part 62', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 2. SITUATION I may have enough time to write my parents a letter later tonight. I want to write them a letter tonight. Both of those things are true. In other words If I have enough time I write my parents a letter later tonight. 3. situation I don t have enough time right now so I won t write my parents a letter. I ll try to do it later. I want to write them but the truth is that I just don t have enough time right now. In other words If I have enough time right now I write my parents a letter. 4. SITUATION I won t have enough time tonight so I won t write my parents a letter. I ll try to do it tomorrow. I want to write them but the truth is that I just won t have enough time. In other words If I have enough time later tonight I write my parents a letter. 5. SITUATION I wanted to write my parents a letter last night but I didn t have enough time. In other words If I have enough time I write my parents a letter last night. 20-2 TRUE IN THE PRESENT OR FUTURE a If I don t eat breakfast I always get hungry during class. b Water freezes or will freeze if the temperature reaches 32 F 0 C. c If I don t eat breakfast tomorrow morning I will get hungry during class. d If it rains we should stay home. If it rains I might decide to stay home. If it rains we can t go. If it rains we re going to stay home. e If anyone calls please take a message. In conditional sentences that express true factual ideas in the present future the simple present not the simple future is used in the -clause. The result clause has various possible verb forms. A result clause verb can be 1. the simple present to express a habitual activity or situation as in a . 2. either the simple present or the simple future to express an established predictable fact or general truth as in b . 3. the simple future to express a particular activity or situation in the future as in c . 4. modals and phrasal modals such as should might can be going to as in d . 5. an imperative verb as in e . f If anyone should call
