介词后面的词是没有规定的。
介词+名词(指方位的,地点的,物品)：at
school，at
home,on
the
desk
介词+动名词:he
is
good
at
playing
football.
介词+表示时间的词:in
the
morning
;
at
noon
介词+人名:except
mr.wang,we
went
to
see
the
film.
介词+
名词性短语:the
composition
is
very
good
except
for
a
few
spelling
mistakes.
所以一般是名词，动词是不会用在介词后面的，要的话也是动名词。