Phrases Expressions of Agreement and Disagreement

I'm not so sure about that.

B1

Meaning

I have doubts.

Example sentences

John: 'He'll definitely pass the exam.'<br>

Alice: 'I'm not so sure about that. He hasn't studied enough.'

John: 'I'm not so sure about that. There are potential risks involved.'

Alice: 'This plan will work perfectly.'<br>