高一英語(yǔ)Festivals around the world教案
ought to / should have done 和 ought not to / shouldn’t have done 用于對(duì)已發(fā)生的情況表示“責(zé)備”、“不滿”，分別表示“本應(yīng)該…”和“本不應(yīng)該…”。例如：
1）with all the work finished, i should have gone to the party last night.
2）you ought not to have made fun of him. he is not the one you laugh at but learn from.
5. needn’t have done
needn’t have done 表示過去做了某事，但沒有做的必要， 意為“本沒必要…”。
you needn’t have waken me up; i don’t have to go to work today.
注：表示推測(cè)過去某動(dòng)作發(fā)生的可能性時(shí)，就表示的可能性程度而言，must最大，could其次，may更次之，might最小。例如：
“i wonder how tom knew about your past.”
“he must / could / may / might have heard of it from mary.”
二、情態(tài)動(dòng)詞+動(dòng)詞進(jìn)行式
情態(tài)動(dòng)詞+行為動(dòng)詞進(jìn)行式（即情態(tài)動(dòng)詞+ be + doing形式），表示推測(cè)或評(píng)論某動(dòng)作現(xiàn)在是否正在進(jìn)行。例如：
1）he must be playing basketball in the room.
2）she may be staying at home.
三、情態(tài)動(dòng)詞+動(dòng)詞完成進(jìn)行式
情態(tài)動(dòng)詞+行為動(dòng)詞完成進(jìn)行式（即情態(tài)動(dòng)詞+ have been + v-ing 形式），表示推測(cè)或評(píng)論過去某動(dòng)作是否正在進(jìn)行或一直在進(jìn)行。例如：
1）they should have been meeting to discuss the problem.
2）he may / might have been buying stamps in the post office when you saw him.
四、某些情態(tài)動(dòng)詞的特殊用法
1. need
考試中主要測(cè)試 need 作情態(tài)動(dòng)詞與作實(shí)義動(dòng)詞的區(qū)別.
情態(tài)動(dòng)詞need與實(shí)義動(dòng)詞need 在時(shí)態(tài)、肯定、否定結(jié)構(gòu)上的對(duì)比見下表。
時(shí)態(tài) 情態(tài)動(dòng)詞need 實(shí)義動(dòng)詞 need
現(xiàn)在時(shí) he need (needn’t) do
need he do….? he needs (doesn’t need) to do
過去時(shí) he needed (didn’t need) to do
將來(lái)時(shí) he need (needn’t) do
need he do….? he will (not) need to do
注: need 一般用于否定句或疑問句.
2. dare
考試中主要測(cè)試dare作情態(tài)動(dòng)詞和作實(shí)義動(dòng)詞的區(qū)別。
情態(tài)動(dòng)詞dare 與實(shí)義動(dòng)詞dare 在時(shí)態(tài)、肯定、否定、疑問結(jié)構(gòu)上的對(duì)比見下表。
句型 情態(tài)動(dòng)詞dare 實(shí)義動(dòng)詞 dare
肯定句 現(xiàn)在時(shí) dare to 少用
過去時(shí) dare to 少用 現(xiàn)在時(shí) dare/dares to do
過去時(shí) dared to do
否定句 現(xiàn)在時(shí) daren’t/dare not do
過去時(shí) dared not do 現(xiàn)在時(shí) do/does not dare (to) do
過去時(shí) did not dare (to) do
疑問句 現(xiàn)在時(shí) dare he do?