“我可以拿这支笔吗？” “当然。”

"Can I take this pen?" "___Sure."

“你想和我们一起去游泳吗？” “当然。”

"Do you want to come swimming with us?" "___Sure."

你问我今晚是否想去看电影。当然！

You asked me if I wanted to go to the cinema tonight. ___sure!