2.0 KiB
Certainty
Certain
に違いない
に{違|ちが}いない means "I'm certain that".
[!info] Example 私は{試験|しけん}を{合格|ごうかく}==に違いない==。 I'm sure I'll pass the exam.
Not always: とは限らない
V
い-Adj
な-Adj + だ
N + だ
+ とは限らない
とは{限|かぎ}らない means "not always", "not necessarily".
[!info] Example {大人|おとな}は{正|ただ}しい==とは限らない==。 Adults are not always right.
Impossible
わけがない
V
い-Adj
な-Adj + な
+ わけがない
Means that there is no way, "impossible". The nuance is that the way of doing is unknown, thus impossible for the subject. But someone else might know. It can also mean that the will to do is not present, especially with する.
[!info] Example もうこんな時間。帰り==わけがない==。 It's already this late. I have no way to go back home (I don't know how).
ようがない・ようもない
~{様|よう}がない means that there is no way, "impossible". Works by removing ~ます from a verb and adding ようがない・ようもない. The nuance it that it is impossible in general. With する, it can mean the same as わけがない, i.e. "I don't know how to".
[!info] Example {全部|ぜんぶ}食べられる==ようがない==よ！ It is impossible to eat it all!
まさか
Usually at the start of a sentence, expresses surprise, about something that seemed impossible.
[!info] Example ==まさか=={僕|ぼく}たちのチームが{負|ま}けた。 I cannot believe our team lost.