Definitely
肯定───sure;肯定───sure
I'm sure we'll manage without.───我相信我们能凑合的。
You don't sound very sure.───听你这口气，你自己也不大肯定。
I'm not sure,' she responded.───我不肯定。”她答道。
You seem like a really great girl and I'm sure that finding friends won't be such a hard thing for you.───你是个好姑娘，找个朋友对你来说应该不是什么难事。
Let other people deal with their problems - Make sure that you do not get too wrapped up in issues of your friends or family members.───让别人处理他们自己的问题—确保不要太过陷入朋友或者家庭成员的问题中去。
"That's part of what the G20 meeting in Pittsburgh is going to be about, making sure that there's a more balanced economy, " he said.───“这是G20匹兹堡会议的部份重点，确保经济更为平衡，”他称。
I'm not sure. Maybe. --It's possible.
Are you sure you can do it?
I'm not sure what he is thinking about.
God’s mill grinds slow but sure.
Mills of God grind slowly but sure.