きっと details
surely + write
kitto kaku
surely; I'm sure — the speaker's confidence in an outcome not yet known
meaning: will surely write
田中さんなら、きっと来るよ。
tanaka-san nara, kitto kuru yo.
If it's Tanaka, he will surely come. casual
心配しないで。きっと大丈夫だよ。
shinpai shinai de. kitto daijoubu da yo.
Don't worry. It is surely fine. casual
- dictionary form
- i-adjective
- na-adjective
- noun
Examples
surely; I'm sure — a confident prediction, or reassurance offered to someone worried
田中さんなら、きっと来るよ。
tanaka-san nara, kitto kuru yo.
If it's Tanaka, he will surely come. casual
心配しないで。きっと大丈夫だよ。
shinpai shinai de. kitto daijoubu da yo.
Don't worry. It is surely fine. casual
この時間の高速は、きっと混んでいます。
kono jikan no kousoku wa, kitto konde imasu.
The motorway is sure to be busy at this hour. neutral
明日の朝はきっと寒いから、上着を持っていってね。
ashita no asa wa kitto samui kara, uwagi o motte itte ne.
It'll surely be cold tomorrow morning, so take a jacket. casual
皆様にきっとご満足いただけるものと存じます。
minasama ni kitto go manzoku itadakeru mono to zonjimasu.
I am confident that this will satisfy everyone. formal
Formation
きっと{V}attaches to dictionary formきっと{I}attaches to i-adjectiveきっと{NA-stem}だattaches to na-adjectiveきっと{N}だattaches to noun
Notes
します commits. A だろう／でしょう tail is common in polite speech
(きっと喜ぶでしょう); casual speech leaves きっと bare and closes on よ.
Related patterns
Similar
きっと commits the speaker to the outcome and is what reassurance is built from (きっと大丈夫); たぶん hedges and leaves the speaker room to be wrong, so it cannot comfort anyone.
に違いない reasons from evidence to a conclusion the speaker treats as forced; きっと needs no evidence at all and can be pure hope — きっと受かるよ encourages, where 受かるに違いないよ would claim to have worked it out.
はず is a noun and heads a clause, so it takes なのに, だった and がない (はずなのに reports a broken expectation); きっと only modifies a predicate, so none of those shapes exist for it — ×きっとなのに — and the confidence has to be carried by the sentence it sits in.