Use I'M NOT SURE IF to Build Sentences

The use of "I'm not sure if" can be used to express a feeling of uncertainty or lack of confidence about a particular issue.

Here are the examples to use "I'm not Sure if" in English:

1. "I'm not sure if I actually want to marry her," Harry said, feeling acutely embarrassed.
2. I am not sure if I can handle it.
3. I am not sure if I understand your question.
4. I am not sure if it will happen.
5. I am not sure if it will matter.
6. I am not sure if my mom will notice.
7. I am not sure if my wife will understand.
8. I am not sure if she'll return my call.
9. I am not sure if they will offer me the job.
10. I am not sure if they will permit us to park there.
11. I am not sure if we will go out tonight.
12. I let some lemonade fall on my clothes, and I'm not sure if I can wash it off.
13. I'm not sure if her sympathy was really genuine.
14. I'm not sure if his forcefulness is an asset or a liability.
15. I'm not sure if I want to marry her.
16. I'm not sure if I'll succeed, but I certainly hope so.
17. I'm not sure if I'm pronouncing this correctly.
18. I'm not sure if I'm pronouncing this name correctly.
19. I'm not sure if Karen is ready for marriage yet.
20. I'm not sure if our book will be a success it's early days yet.
21. I'm not sure if she has the right temperament for the job.
22. I'm not sure if the argu-ment holds up, but it's stimulating.
23. I'm not sure if this is the right road or not.
24. Though I'm not sure if I should be proud or ashamed of this factoid.

See: Use THERE'S NOTHING + CAN to Build Sentences