おそらく自分には半覚醒の時間があり、そのため１日を短く感じている。

tbd

It's quite possible that there are times I am half awake, and thus the day feels shorter.

おそらく、見張りに重大な欠陥があったんではないかと考えています。

tbd

I think that it likely that there was a major fault in the lookout.

これはおそらく戸籍上の出生年月日を調べた上で修正したのではないかと思います。

tbd

I believe this may be a correction after investigation of his date of birth in the family register.

例外は中国で、おそらく平らなパンは食されていなかった。

tbd

The exception was in China, where flat bread was probably not eaten.

夕刻にはおそらく雨になるだろう。

tbd

We may well have rain this evening.

明日は恐らく雨が降るでしょう。

tbd

It will rain perhaps tomorrow.

彼女はおそらく試験に合格するでしょう。

tbd

She'll almost certainly pass the test.

It may be that she will succeed in the examination.

彼女はおそらくまだ寝ているのだろう。

tbd

The chances are that she is still in bed.

彼らはおそらく来週到着するでしょう。

tbd

We think it possible that they may arrive next week.

They're very likely to arrive next week.

I think it's very likely that they'll arrive next week.

彼らはおそらく私たちの計画に賛成するだろう。

tbd

They are likely to agree to our plan.