高一英語(yǔ)Festivals around the world教案
3）will and would
the spring festival is the most fun. the whole family will come for dinner.(promise;agreement)
often he would dress up like a rich man.(past habit; custom)
would you like to join us for dinner?(request)
注意：would 與 used to 均可表示“過(guò)去慣常”，但是would 常與過(guò)去時(shí)間狀語(yǔ)連用，意為總是，總要；used to 與現(xiàn)在時(shí)間相比，意為過(guò)去常常，暗示現(xiàn)在已經(jīng)沒(méi)有了。
eg.when he was there, he would go to that coffee shop at the corner after work every day?
he used to go to that coffee shop at the corner after work every day,but now he goes to play basketball.
4)shall and should
the harvest festival begins on saturday.we shall be there with our friends.(promise, agreement)
it’s nearly five o’clock. the taxi should be here soon.(prodiction)
注意：1.shall 用于第一，三人稱的疑問(wèn)句中，表示說(shuō)或者征求對(duì)方的意見(jiàn)，或向?qū)Ψ秸?qǐng)示。
eg.shall we go shopping after school?
2.should have done 表示過(guò)去應(yīng)該做而沒(méi)有做
should not have done 表示過(guò)去不用做而卻做了
5）must and can’t
wang feng wins an award every year. he must be very strong.(speculation)
you must be joking. that can’t be true. (guessing)
對(duì)現(xiàn)在的事情進(jìn)行把握較大的判斷時(shí)，肯定判斷用must+動(dòng)詞原形，否定判斷用can’t+動(dòng)詞原形。
she must be in the library.
she can’t be in the room.
2.modal verbs+ have done
一、情態(tài)動(dòng)詞+動(dòng)詞完成式
情態(tài)動(dòng)詞+動(dòng)詞完成式即“情態(tài)動(dòng)詞+ have + done分詞”，表示對(duì)過(guò)去行為或動(dòng)作進(jìn)行推測(cè)、評(píng)論或判斷。
1. must have done表示對(duì)過(guò)去某事的肯定猜測(cè)。其否定或疑問(wèn)形式都用can(could) 來(lái)表示.
since the road is wet, it must have rained last night.
he can’t have missed the way. i drew him a map.
“the dictionary has disappeared. who could have taken it?”
當(dāng)然對(duì)現(xiàn)在發(fā)生或?qū)?lái)發(fā)生的事情,要用must do 表示猜測(cè), 否定為can’t do.
he must understand that we mean business.
you must be hungry after a long walk.
2.may / might have done
may / might have done 表示推測(cè)過(guò)去某事“也許”發(fā)生了.may 比 might 表示的可能性在說(shuō)話人看來(lái)稍大些。例如：
i can’t find my keys. i may / might have left them at the school yesterday.
3. could have done 在肯定句型中, 往往用作委婉的批評(píng). 本應(yīng)該做什么,而沒(méi)做; 有時(shí)也用作猜測(cè).
you could have told us earlier.
tom could have taken the dictionary.
4. ought to / should have done和 ought not to / shouldn’t have done