I am not good at using '...でしょう', and do not fully understand its meaning and
usage. For example:

> 彼はｱﾒﾘｶへ行くんでしょう
>
> そのことをわからないんでしょう

Such sentences always make me confused. Could you explain it for me?
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2016-10-05T10:52:16.193
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grammar word-usage
What does '........でしょう' mean?
[でしょう](http://jisho.org/search/%E3%81%A7%E3%81%97%E3%82%87%E3%81%86) is a more
polite form of [だろう](http://jisho.org/search/%E3%81%A0%E3%82%8D%E3%81%86)
which is broadly used to suggest a speaker's guess and supposition. That means
the speaker is not sure about it.

For example:

> これは[本物]{ほんもの}のダイヤでしょう. (I am not sure about it but) This is **probably** a
> real diamond.
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2016-10-05T11:11:17.517
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Related: [Other meanings of でしょう besides
"probably"](https://japanese.stackexchange.com/questions/1558/other-meanings-
of-%e3%81%a7%e3%81%97%e3%82%87%e3%81%86-besides-probably)

It's likely the 2nd usage of でしょう similar in meaning to ね but it depends on
the context but could also be the first, showing uncertainty on the side of
the speaker.

> 彼はｱﾒﾘｶへ行くんでしょう

He's going to the states, right?

> そのことをわからないんでしょう

You don't get it, do you?
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2016-10-05T16:37:12.607
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でしょう is polite version of だろう. That means probably, displaying conjecture.

> 彼女は(多分)彼の恋人だろう. She is probably his girlfriend.
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2016-11-23T02:15:30.977
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