infinitive

n.

（动词）不定式；

adj.

不定式的；

复数：infinitives

1. Perfect infinitive means the action happed before the main verb.
   完成不定式表示动作发生于主要动词之前。
2. The use of the split infinitive is now generally acceptable.
   分裂不定式的用法现在已被广泛接受。

The Rise of the to-infinitive
The rise of the to-infinitive
FROM PURPOSIVE TO INFINITIVE ― A UNIVERSAL PATH OF GRAMMATICIZATION
The Synchrony and Diachrony of the Balkan Infinitive
Case theory and infl-to-comp: the inflected infinitive in European Portuguese
Specific language impairment as a period of extended optional infinitive.
Grammaticality Judgments of an Extended Optional Infinitive Grammar: Evidence from English-Speaking Children with Specific Language ...
Grammaticality judgements of an extended optional infinitive grammar: evidence from English-speaking children with specific language...
Explaining quantitative variation in the rate of Optional Infinitive errors across languages: a comparison of MOSAIC and the Variati...
Very early parameter setting and the unique checking constraint: A new explanation of the optional infinitive stage ☆