- Can you help me paint the hall this weekend?
- Can you help me to paint the hall this weekend?
Do we add "to" the second verb (paint) because it's in the infinitive?
- Can you help me paint the hall this weekend?
- Can you help me to paint the hall this weekend?
Do we add "to" the second verb (paint) because it's in the infinitive?
Help can be followed by an object and infinitive, with or without "to".
So, both are correct.
The first statement (without "to") is common in an informal style.
Ref:'Practical English Usage' by Michael Swan ELBS