Word Meaning 不定

船長は、スケジュールが不定だった。

The ship's captain had no schedule in particular.

toのつかない不定詞を原形不定詞と言う。

An infinitive without a 'to' attached is called a bare infinitive.

次の動詞はｔｏ不定詞だけを目的語にとります。

The following verbs only take the to-infinitive as their object.

needless to sayは不定詞の慣用表現として紹介されることが多いです。

'Needless to say' is often used as an idiomatic expression in the infinitive.

不定詞の形容詞的用法には２種類あり、①限定用法、②叙述用法。②はもちろん主格補語です。

There are two ways of using the infinitive as an adjective, 1. attributive, 2. predicative. Naturally 2. is a subject complement.

動詞helpはto不定詞・原形不定詞の両方をとりますが、くだけた文体では原形不定詞が多いとされており、この例文でもそれが使われています。

The verb 'help' takes to-infinitives and bare infinitives but bare infinitives are said to be the most common in casual text; as also used in this example sentence.