人教版九年级英语第八单元知识点总结 Unit 8 It must belong to Carla. 一．单词 whose truck picnic rabbit attend valuable pink anybody happening noise policeman wolf uneasy laboratory outdoors coat sleepy land alien run after suit express all the same time circle Britain mystery receive historian leader midsummer medical purpose prevent energy position burial honor ancestor victory enemy period hard-working 情态动词表推测：语气+时态 （一）情态动词表推测的三种语气 1.在肯定句中一般用must (一定)，may（可能），might / could（也许，或许）。 He must/may/might know the answer to this question?他一定/可能/也许知道这个问题的答案。 2.否定句中用can’t / couldn’t(不可能), may not/might not(可能不)。 It can’t/couldn’t be the headmaster. He has gone to America.这不可能是校长，他去美国了。 3.疑问句中用can/could (能……?)。 Could he have finished the task? 他可能把任务完成了吗？ （注：以上三种句式中情态动词的语气按程度都是依次递减的。Might, could 并非may, can的过去式，而表示语气较为委婉或可能性较小。 （二）情态动词表推测的三种时态 1.对将来情况的推测，用“情态动词 + 动词原形”。 She must / may / might / could arrive before 5. 5:00 前她一定/可能/也许到。 2.对现在或一般情况的推测，用“情态动词 + be”，“情态动词 +be doing”或“情态动词 + 动词原形” （1）He must / may / might / could be listening to the radio now. （2）He can’t ( couldn’t ) / may ( might ) not be at home at this time. （3）Mr. Bush is on time for everything. How can ( could ) he be late for the opening ceremony ?布什先生一向准时，这次开幕式他怎么可能迟到呢？ 3.对过去情况的推测，用“情态动词 + have +过去分词”。 （1）It must / may / might / could have rained last night .The ground is wet. （2）The door was locked. He can ( could ) not / may ( might ) not have been at home . 门锁着，他不可能/可能不在家。 ...
