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英语中有许多此表达“也许”，但归纳起来，无非就三类：
.
likely, possible, probable.
maybe, perhaps, possibly, probably.
一．情态动词may (might)和can (could)
，表达客观的(理论的)也许性，并不波及详细某事与否会发生，常可以阐明人或事物的特征。要体现详细某事实际，发生的也许性时，不可用can,须用could, may, might 。
如：
(1)A left-luggage office is a place where bags can be left for a short time ,especially at a railway station.[全国,28]
行李寄存处，尤其是在火车站，使人们可以短期寄存行李的地方。(客观也许性)
(2)Accidents can happen on such rainy days.
这种下雨的天气也许会发生事故.(客观也许性)
(3)Peter may come with us tonight ,but he isn’t sure yet.[1993全国,27]彼得今晚也许来我们这儿，但还没确定.(实际也许性)
(4)We may go camping next Sunday.
下星期我们也许去野营.(实际也许性)
2. may not 表达“也许不”，can not/can’t表达“不也许”，can(could)可用于疑问意义。
如：
(1)---- Is John coming by train ?
---- He should ,but he may not .He likes driving his car.[全国，25](表达“也许不”)
(2)A computer can’t think for itself ;it must be told what to do .[1991全国,15](表达“不也许”)
(3)Mr Bush is on time for everything .How can it be that he was late for the opening ceremony ?[上海,27]
试比较：
This can’t be done by him .这不也许是他干的。
This may not be done by him .这也许不是他干的。
Can this be done by him ?这也许是他干的吗?
(此处不可用may，may用于疑问句表达“可以”。但此句可以说：Is this likely to be done by him ?)
此外，could ,might并不一定与过去的时间有关，而表达也许性弱于它们对应的目前时形式。
如：
This could/may/might be done by him .这件事有也许是他干的。（语气依次递减）
二、形容词：likely , possible , probable
，只“从表面及想来看很有也许”，常用句型:
sb./sth be likely to do or It is likely that... 如：They are likely to become angry with him .
他们也许会对他发火。
It is likely that he will come.
注意:（1）、 likely表达“有也许成功的”、“有但愿的”意思时，不能用此外两词。
What is the likeliest time to find him at home?什么时候最也许在家里找到他？
(2).likely在作副词时，前面一定要加very或most. They’ll very likely ask for an increase in the budget. 他们很也许规定增长预算。
2 possible指“由于有合适的条件和措施，某事也许发生或做到”，强调“客观上有也许”，但常具有“实际但愿很小”的意思。
如：I will do everything possible to help you .
我将尽一切也许协助你.
常用句型: It is possible for sb. to do something It is possible that…
It is possible for one man to finish this.
It’s possible that he will accept the terms.
注意:possible不能以人作主语，也不能说make sb. possible,应说make it possible for sb. to do sth.
This made it possible for him to go abroad for further studies.
3 . probable 语气比possible强，指有根据、合情理、值得相信的事物，带有大概、很也许 的意思。
如：The home team , far ahead , is the probeble winner.
主队份遥遥领先，很也许成为胜利者。
注意: probable也不能以人作主语,也不能用于It is probable for sb. to do , 但可用于句型：It is probable that…
It is probable that the winner will get a prize.
此外，这三个形容词likely , possible , probable 都可用于句型：It is +adj.+to do sth./that-clause. It作形式主语。但只有likely可以用于句型：sb./sth be likely to do sth .
如：(1)    It is probable that it will rain today.
今天很也许会下雨。(第一种it是形式主语，第二个是天气。)
(2)    She is the most girl to win the prize.
由于主语是人，“有但愿的”。
试比较：
( ╳) It is probable to rain today.(It指天气)
( √ ) It is likely to rain today.(It指天气)
但可以说：He is impossble to teach.(=It is impossible to teach him.)
注意：不定式动词与主语存在着逻辑上的动宾关系时，句子才对的。