きっと、たぶん、もしかしたら

See ③ ～でしょう & ⑥ ～かもしれません in  HOW TO USE PLAIN FORM - 普通形の使い方

①　きっと(kitto)

This adverb indicates that the speaker is quite certain of what (s)he is saying. The probability ranges from quite high to the same level as that of ～でしょう(~ deshou)

ミラーさんは　きっと　来ます。

Mira- san wa kitto kimasu.

Mr. Miller will surely come.

明日は　きっと　雨でしょう。

Ashita wa kitto ame deshou.

It will undoubtedly rain tomorrow.

②　たぶん(tabun)

This adverb entails LESS certainty than きっと, and is MOSTLY used with　～でしょう. As shown below, たぶん is VERY often used with ～と思います(~ to omoimasu)

ミラーさんは　来るでしょうか。

Mira- san wa kuru deshou ka?

(Do you think) Mr.Miller will come?

・・・たぶん　来るでしょう。

Perhaps he will come/ I guess so.

山田さんは　このニュースを　たぶん　知らない と 思います。

Yamada san wa kono nyu-su wo tabun shiranai to omoimasu.

I think maybe Mr.Yamada doesn't  know this news/ I guess Mr. Yamada does not know this news.

③　もしかしたら(moshikashitara)

This adverb is used with ～かも　しれません(~kamo shiremasen) in MOST cases. 

A sentence with　もしかしたら expresses the idea that there is less of a possibility of some event or situation occurring (e.g. "I cannot graduate")

もしかしたら　３月に　卒業できない　かもしれません。

Moshikashitara sangatsu ni sotsugyou dekinai kamo shiremasen.

Possibly I can't graduate in March

- Anh

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