®能力He can speak French. 他會說法文
®允許You can leave if you want . 如果你想你可以離開
®可能性He can be here soon. 他可能很快到這裡
®過去的能力He couldn't speak English. 他不會說英文
®請求Could you come in, please? 你可以進來嗎?
®可能性He could be late a little bit. 他可能晚到(could的可能性比can小)
®請求May I interrupt?我可以插嘴嗎?
®允許You may have the cake.你們可以吃這蛋糕
®可能性He may/might call me tonight.他今晚可能來電(might的可能性比may小)
®祈願 May God bless you.但願上帝保佑你
(4). Should/Ought to/be supposed to的用法
®忠告He should study harder.他應該用功些
®義務He ought to work harder in his homework.他應該在功課上更認真些
®應該 You are supposed to be there on time.你應該準時到那裡
(5). Must/ Have to/Have got to/Had better
®強烈必要性Everyone must sign up.每個人都必須簽名
®一般必要性We have to study before the exam.我們在考試前必須讀書
®口語用法 I have got to run.我必須要走了
®最好 You had better stay here.Don’t go away.你最好待在這裡不要離開
®未來式 I will call you tonight.今晚我將打電話給你
®請求 Will you reserve a table for three? 你可否保留三人座的桌子給我?
®可能 He would come here late.他可能晚點到
®請求Would you please tell me where she is?你可否告訴我她在哪?
®過去曾經 He would play in the yard when he was a kid.當他是小孩時他常在院子玩
(1). MUST HAVE+PP(表示對過去的推測)
®He must have missed the train.他一定錯過火車了
®Brooke must leave now.
®Brooke must have left last night.
®I should have taken medicine this morning.今早我應該要吃藥的
®Chad should do his homework now.
®Chad should have done his homework last night.
(3). COULD HAVE+PP(表示對過去的推測)
®He could have watched the DVD before. 他可能之前看過這 DVD了
®The child could fall asleep at the moment.
®The child could have fallen asleep at the moment last night.