1. possible可能性较小，一般当主语是动词不定式的施动者时，不能以表示人的词语作possible或impossible的主语，请看：
She is impossible to come here on time today.(错)
She is not likely to come here on time today.
今天她是不可能准时到这了。
常见句型是：
It is impossible(possible) for sb to do.
当主语在意义上是动词不定式中介词的宾语时上述两种表达都是正确的，如：
She is impossible to deal with.=
It is impossible for her to deal with.
无法和她打交道。
He’s impossible to work with.=
It’s impossible for him to work with.
无法和他在一起共事。
She’s impossible to talk to when she’s angry.=
It’s impossible for her to talk to when she’s angry.
她生气时是无法与之交谈的。
在其他的情形之下，possible(impossible)作表语时， 是不能用表人的词来做句子主语的。
2. likely adj.（四级、六级，考研常见）
可能的；有希望的；预料的；仿佛恰当的；似乎合适的
adv.
可能；或许
其描述的可能性比较大但是比probable弱。指可能发生或属实的，强调可能性。可以单独做定语或表语
She is not likely to come here on time today.
今天她是不可能准时到这了。
They aren't likely to arrive this side of midnight.
午夜之前他们不大可能赶到。
Children of smokers are more likely to start smoking than are children of non-smokers.
吸烟者的子女比不吸烟者的子女更有可能会抽烟。
Women are more likely than men to be carers of elderly dependent relatives.
和男人相比，女人更有可能照看无法独立生活的年老亲戚。
Young people were several times more likely to be out of work than older members of the workforce
劳动人口中，年轻人失业的可能性是年长者的好几倍。
The young are more likely to abandon themselves to arcade games.
年轻人们更有可能沉迷于电子游戏。
Research suggests that children whose parents split up are more likely to drop out of high school
研究表明，父母离异的孩子更容易从中学中途退学。
Single parents are more likely to be permissive.
单亲家庭的父母更容易放任自己的孩子。
Children from broken homes are more likely to leave home before the age of 18.
破裂家庭里的孩子在18岁之前离家的可能性更大。
Women are much more likely than men to waken because of noise.
女性通常比男性更易被噪音吵醒。
He is hardly likely to admit he was wrong.
他不大可能承认自己错了。
He is likely to get off with a small fine.
他可能会逃脱严惩，仅仅罚一点钱了事。
Morris is likely to win, with Jones out of the picture now.
琼斯现已出局，莫里斯极有可能胜出。
This decision is likely to upset a lot of people.
这项决定很可能会使许多人不快。
Tickets are likely to be expensive.
入场券可能很贵。
It's more than likely that the thieves don't know how much it is worth.
盗贼很可能不知道此物的价值。
They might refuse to let us do it, but it's hardly likely .
他们也许会不让我们做这工作，但这可能性太小。
The report is likely to prove highly embarrassing to the government.
这份报告可能会让政府非常尴尬。
Train fares are likely to remain unchanged.
火车票价很可能会保持不变。
The increase is likely to hit the pocketbooks of consumers.
提价可能会砸到消费者的钱袋子。
The closure of the factory is likely to cost 1 000 jobs.
那家工厂一关闭，很可能1000个工作岗位就没有了。
The allegations are likely to damage his political career.
这些指控有可能伤及他的政治生涯。
The tension between the two countries is likely to remain
那两个国家间的紧张局面可能会持续下去。
Education is likely to be a key issue in the next election.
在下届选举中教育可能成为最重要的一个议题。
Rain showers are likely tomorrow.
明天可能有阵雨。
It's likely someone gave her a lift, or else that she took a taxi.
可能有人开车捎了她一程，要不就是她打了辆出租车。
It is likely that investors will face losses
投资者们可能要面临损失。
It is likely that they would go into hiding for a few weeks, and resurface when the publicity has died down.
他们很可能会躲藏几个星期，等风声过了以后再露面。
It is likely that babies are not born knowing the basic fact of the universe; nor are they ever clearly taught it ．高考真题- 2016 浙江
很可能婴儿并不是生来就了解周围的世界；也从来没有人明确地教导过他们。