“To enable him to escape” vs. “to enable him escape”

I have been coming across this kind of sentence more and more:

She gave him a key to enable him to escape capture.
She gave him a key to enable him escape capture.

Which sentence is correct? My understanding is that the preposition should be repeated as both enable and escape are verbs.

Answer

“To” isn’t a preposition here, it’s part of the verb. Sentences like this generally use the full infinitive (or to- infinitive) to introduce the subordinate clause. Like I just did there.

She enabled him to escape capture.
She helped him to choose a new wardrobe.
She told him to go away.

Help turns out to be able to use a bare infinitive instead:

She helped him choose a new wardrobe.

but not

She enabled him escape capture.

With some verbs, you must use the bare infinitive. Mostly these are verbs concerning perception or permission; unfortunately you just have to know which ones are which.

She saw him run away.
She let him go.

but

She allowed him to go.
She observed him to run away. (This particular one is very unusual, and I wouldn’t use it if I didn’t have to!)

Attribution
Source : Link , Question Author : Nancy , Answer Author : Community

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