Grammar fix
I'm not so sure about that
softly disagree
A gentle way to signal you disagree without flatly saying 'no'.
expressionB1common
Hear it in context
Notice where the phrase sounds natural.
Cheaper is always better? I'm not so sure about that.
A: Everyone will love it, trust me.
B: Hmm, I'm not so sure about that.
Fix the pattern
One small grammar move makes it sound right.
Not: I'm not sure so about that.
Say: I'm not so sure about that.
Word order is 'not so sure'; 'so' goes before 'sure', not after.