good at V-ing (preposition + V-ing)
good at V-ing (preposition + V-ing) means “After any preposition, a verb takes the -ing form: good at swimming, before leaving”. A preposition (at, for, in, of, about, on. Formation: preposition + V-ing (good at swimming, thank you for coming)
After any preposition, a verb takes the -ing form: good at swimming, before leaving
A2Formation
preposition + V-ing (good at swimming, thank you for coming)
Explanation
A preposition (at, for, in, of, about, on...) is always followed by a noun or a verb in the -ing form, never a base verb: good at swimming, thank you for coming, interested in learning, afraid of flying. This is true whether the preposition follows an adjective (good at), a verb (think about), or a noun (the idea of). Say thank you for helping, not thank you for help.
Examples
Note
Watch the word to: in look forward to and be used to it is a preposition, so V-ing follows (look forward to seeing). But in want to, to belongs to the infinitive, so a base verb follows.
FAQ
good at V-ing (preposition + V-ing) — what does it mean and how is it used?
After any preposition, a verb takes the -ing form: good at swimming, before leaving. A preposition (at, for, in, of, about, on...) is always followed by a noun or a verb in the -ing form, never a base verb: good at swimming, thank you for coming, interested in learning, afraid of flying. This is true whether the preposition follows an adjective (good at), a verb (think about), or a noun (the idea of). Say thank you for helping, not thank you for help.
good at V-ing (preposition + V-ing) — how do you form it?
preposition + V-ing (good at swimming, thank you for coming)
good at V-ing (preposition + V-ing) — any usage notes?
Watch the word to: in look forward to and be used to it is a preposition, so V-ing follows (look forward to seeing). But in want to, to belongs to the infinitive, so a base verb follows.