probably和possibly的区别：中文含义不同、用法不同、强调重点不同。probably意思为“大概、很可能”，指可能性很大，含肯定成分较多，主要修饰谓语动词；possibly意思为“也许”，指可能性不是很大，多用于否定句，在疑问句和否定句中多与can连用。

probably意为可能;大概;几乎肯定。指可能性很大，主要修饰谓语动词，在句子里如果有一个助动词和一个主要动词。

例句：It was the best known and probably the most popular of her songs.

这是她最著名的、大概也是她最受欢迎的歌曲。

The two cases are most probably connected.

这两桩案件极有可能互相关联。

The White House probably won't make this plan public until July...

白宫可能要等到7月份才会公开这个计划。

He probably thinks you're both crazy!

他可能认为你们两个人都疯了！

You are probably well enough to take a little light exercise.

你恢复得不错，大概可以做些轻微的运动了。

He'll probably say no, though it's worth asking.

他很可能会拒绝，不过问一下有益无损。

As you probably know, I'm going to be changing jobs soon.

你或许知道，我不久就要换工作了。

The driver of the car probably holds the key to solving the crime.

这位汽车司机很可能掌握破获这一罪案的关键证据。

The Democrats will probably lose control of Congress.

民主党很可能失去对国会的控制。

Now is probably as good a time as any to start a business.

目前可能正是创业的最佳时机。

She probably has a good mind, which should be used to the full

她可能很有头脑，应该充分运用。

possibly作为副词，意为可能地;可能;或许;强调惊奇、恼怒等;表示委婉的请求;尽量。是指可能性不是很大，在肯定句里多与may或will连用，在疑问句和否定句中多与can连用。

例句：It was possibly their worst performance ever.

这也许是他们迄今为止最糟糕的表现。

You can't possibly mean that!

你绝不会是那个意思吧！

Could you possibly open that window?

请你把那扇窗子打开好吗？

They tried everything they possibly could to improve the situation.

他们为改善局面用尽了一切办法。

You can't possibly carry all those bags.

你绝拿不了所有这些包包袋袋的。

It was the most unexpected piece of news one could possibly imagine...

这条新闻最出人意料了，真是让人想象不到。

They've done everything they can possibly think of...

凡是能想到的，他们都去做了。

No I really can't possibly answer that!

不，我无论如何也回答不了那个问题。

He started working hard much too late in the day ─ he couldn't possibly catch up.

他开始努力工作已为时太晚——不可能赶上了。

Their captain said his team had played as well as it possibly could

队长说他们队发挥出了最佳水平。