反义疑问句can.docx

反义疑问句 can
篇一：反义疑问句 can】
can的反意疑问句一般要分两种情况来说.
can 如果是表示“能力/许可/请求”等时,则直接以 can 来变即可.
如你的例子：he cant go to school today,cot to / shouldn't have done ought to / should have done 和 ought not to / shouldn't have done 用于对已发生的情况表示“责备”、“不满”，分别表示“本应 该…”和“本不应该…”。例如：
with all the work finished, i should have gone to the party last night.
you ought not to have made fun of him. he is not the one you laugh at but learn from.
needn't have done
needn't have done 表示过去做了某事，但没有做的必要， 意为“本 没必要…”。例如：
you needn't have waken me up; i don't have to go to work today.
注：表示推测过去某动作发生的可能性时，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、情态动词+动词进行式 情态动词+行为动词进行式（即情态动词+ be + doing 形式），表示 推测或评论某动作现在是否正在进行。例如：
1） he must be playing basketball in the room.
2） she may be staying at home.
三、情态动词+动词完成进行式 情态动词+行为动词完成进行式（即情态动词+ have been + v-ing 形式），表示推测或评论过去某动作是否正在进行或一直在进行。
例如：
they should have been meeting to discuss the problem.
he may / might have been buying stamps in the post office when you saw him.
四、某些情态动词的特殊用法
1. need
考试中主要测试 need 作情态动词与作实义动词的区别。情态动词 need 与实义动词 need 在时态、肯定、否定结构上的对比见下表。 时态 情态动词 need 实义动词 need
现在时 he need (needn't) do need he do…・？
he needs (doesn't need) to do
过去时
he needed (didn't need) to do
将来时
he need (needn't)do need he do…・？
he will (not) need to do
注: need