- Check my video for more details! -
https://www.youtube.com/watch?v=QU7HCywOMTM&t=164s
Using deshou (でしょう) at the end of a sentence means that something will probably happen or that it seems like it will happen. The level of certainty in that “might” is probably around 80-90%  This means that the probability of accuracy is a more than a kamoshiremasen sentence.

でしょう (deshou) is commonly used when we talk about the weather in Japanese. 

verbs
{ 食べる　/　食べた } 　でしょう。
{ taberu / tabeta } deshou.
(someone will probably eat / probably ate)

i-adjectives
{ 高い　/　高かった } 　でしょう。
{ takai / takakatta } deshou.
(something is / was probably expensive)

na-adjectives
{ 静か　/　静かだった } 　でしょう。
{ shizuka / shizuka datta } deshou.
(something is / was probably quiet)

nouns
{ 学生　/　学生だった } 　でしょう。
{ gakusei / gakusei datta } deshou.
(someone is / was probably a student)

雨が降るでしょう｡
ame ga furu deshou.
(it will probably rain)

明日は晴れるでしょう｡
Ashita wa hareru deshou.
(It will probably be sunny tomorrow)

彼女は 綺麗でしょう。
kanojyo wa kirei deshou
(I assume she is beautiful.)

今夜は風が強いでしょう。
Kon’ya wa kaze ga tsuyoideshou.
(The wind will be strong tonight.)

あの人は田中さんでしょう。
Ano hito wa Tanaka-sandeshou.
(I guess that person is Ms. Tanaka.)

When でしょう (deshou) is used to guess or predict something, it can take on the form of a question because it naturally seeks confirmation to something with a bit of uncertainty.

今日は木曜日でしょう｡
kyo wa mokuyoubi deshou?
(Today is Thursday, isn’t it?)

眠いでしょう｡
nemui deshou?
(You’re sleepy, aren’t you?)

どう？美味しいでしょう？
dou? oishii deshou?
(How are they? They're good,  isn’t it?)

You can use the more casual だろう(darou) if you’re talking with people you are close with (friends, family, close co-workers, etc.)

雨が降るだろう｡
ame ga furu darou.
(it will probably rain)

眠いだろう｡
nemui darou?
(You’re sleepy, aren’t you?)

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