The clauses V-ing as prepositional objects - Free english lesson
Chapter The nominal clauses in V-ing

The gerund is compulsory after all the prepositions.
We object to their being released.

When « to » is a preposition, it is followed by V-ing.
She prefers cooking to playing tennis.
I object to spending any more energy.

When « to » is the mark of the infinitive, we cannot use the form V-ing.
I want to leave.

A noun or a pronoun can be placed between the preposition and V-ing.
Do you object to Max smoking?
Do you object to Max's smoking?
(accurate language)

Progress in english with the story of the Lacoste family.
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