After / Before / for 後面

因為我地當佢係preposition黎用
所有preposition後邊都要加noun
包括真正既noun同gerund(姐係加ing果d)
After同before如果唔當preposition用既話可以唔係ing,
例如:After I had read this book,I got nothing.
如果當preposition用既話
例如:After taking the exams,I felt very relaxed.
i hope it is helpful.