"我能借你的笔吗？" "当然可以！"

"Can I borrow your pen?" "___Of ___course!"

"你当然可以借我的书，"她说。

"___Of ___course you can borrow my book," she said.

"你来参加派对吗？" "我当然来！"

"Are you coming to the party?" "___Of ___course I am!"