What does '........でしょう' mean?


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?




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.

