通常用于表达对某件事情的不确定性或疑虑，强调个人对某种情况的不确定感。
I'm not sure about that.
I'm not sure if I can make it.
I'm not sure where I put my keys.
I'm not sure what to do next.
I'm not sure if I understand.
I'm not sure what time it is.
I'm not sure if I agree.
I'm not sure where to go.
I'm not sure if it's the right decision.
I'm not sure if I remember correctly.
I'm not sure if I can make it to the party tonight.
I'm not sure where I left my keys.
I'm not sure what time the movie starts.
I'm not sure if I turned off the stove before leaving the house.
I'm not sure if I locked the front door.
I'm not sure what to wear to the wedding.
I'm not sure if I have enough money to buy groceries this week.
I'm not sure how to solve this math problem.
I'm not sure if I'm going in the right direction.
I'm not sure if I'll be able to finish the project on time.
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