一. possible

1. It is possible（for sb）to do sth.

2. It is possible that从句

二. probable

1. Sth. is probable.

2. It is probable that从句。

三 likely

1. 主语（人或物）is likely to do sth.

2. It is likely that从句。

总结：

二、用法上的异同
1. 这三个词都可用于“ It + 系动词 + … + that 从句”句式。例如：
2. possible 和 likely 后面可以接不定式的一般式。例如：
3. 只有 be likely 前面的主语可以是人，而 possible 和 probable 不能。例如：
She's very likely to ring me tonight. （ = It's very likely that she'll
ring me tonight. ）她今天晚上很可能打电话给我。
4. 只有 possible 后面可以接 for sb. to do sth, 而 likely 和 probable 不能。例如：
Will it be possible for someone to meet me at the gate about 9:30 a.m. ?
上午九点半左右有人在大门口要见我，有可能吗？
5. possible 可和表示条件的连词 if 连用，构成 if possible （ = if it is possible to do sth. ）。例如：
6. possible 还可构成 as … as possible ，意为“尽可能……”。例如：
辨析：

Success is possible, but hardly probable.成功是有可能的，但把握性不大。

Possible, if not probable. 即使不见得会发生，至少是有可能的。

[√] It is possible for him to do this.
[√] It is possible that he will do this.
[×] He is possible to do this.

possibly, probably,likely,perhaps用法浅析

一 possibly常常与情态动词can,must连用

It may possibly be true．也许是真的

Please call me as soon as you possibly can．请尽快给我打电话。

二 probably

Could you possibly tell me the answer﹖你能告诉我这个答案吗？
It will probably be fine tomorrow．明天大概会是晴天。
译：她大概不会来这里。
正：Probably she won’t come here．
正：She probably won’t come here．
正：She won’t come here probably．

三 likely

3) perhaps“或许”，含有“可能这样，也可能不这样”之意，其含义和用法与maybe一样，多用于口语。maybe多用于美国英语。在这几个单词中，语义最强的是probably，其次是perhaps和maybe，最弱的是possibly。例如：
Perhaps we will be late for work．或许我们上班会迟到。
Perhaps we’d better take a bus．也许我们最好乘公共汽车。
误：She won’t probably come here．

常和can, may, must等情态动词连用，比probably语气弱很多

There is a little probability of his success.

他不大可能成功。

2. The probability of a peace agreement being reached is zero.

达成和平协定的概率是零。

3. What are the probabilities?

可能发生什么事？

4. In all probability he's already left.

大有希望的候选者、竞争者等。

5. What is the probability of its success?

其成功的可能性如何?

6. There is little probability of his succeeding/that he will succeed.

他不大可能成功.

7. A fall in interest rates is a probability in the present economic climate.

从目前的经济情势看, 很有可能降低利率.

8. Having disappeared for long, he has been kidnapped in all probability.

他失踪了这么久十之八九是被绑架了