Тема: герундий! excuse me.. giving you so much trouble. somebody should prevent him.. doing stilly things. the teacher insisted.. doing the exercise in writing. everybody congratulated him.. having defended his thesis successfully. i'm looking forward.. hearing form you.

Excuse me for giving you so much trouble. Somebody should prevent him from doing stilly things. The teacher insisted on doing the exercise in writing. Everybody congratulated him on having defended his thesis successfully. I'm looking forward to hearing form you.