1. I am 100% about that.
2. I am 100% sure about that.
3. I am positive about that.
4. I am 100% positive about that.
5. I am 100% certain about that.
(Are they the same and grammatical?)
2. I am 100% sure about that.
3. I am positive about that.
4. I am 100% positive about that.
5. I am 100% certain about that.
(Are they the same and grammatical?)