htm This is a good rule. It has no exceptions! If we want to use a verb after a preposition, it must be a gerund.
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dimsumexpressGerunds after Prepositions: before, after, when, at, to, about... and ... is "when" a preposition?
PicnicWhat are you confused about, Picnic?
WHAT
I am confused,
can you explain again?
PicnicYes, but what are you confused about?
you got me confused...=/