2 is correct. You'd use 1 only if it was one degree.
4 is better. He has one cell phone, right? You'd use "the" only if you were referring to the very latest one on the market, such as iPhone XR.
1. Water freezes at zero degree.
2. Water freezes at zero degrees.
[Which one is correct?]
3. My best friend has the new cellphone.
4. My best friend has a new cellphone.
[What is the difference between #3 and #4? Why is 'the new cellphone' used in #3?]
1 answer