Answer:
Usually, in the present tense, if the subject is singular the verb ends with an "s" and does not end with an "s" when the subject is plural. There are exceptions to this.
1. Do (plural, present)
2. is (singular, present)
3. is (plural, present)
4. devotes (singular infinitive, ongoing)
5. advocate (plural infinitive, ongoing)
6. own (plural, present)
7. is (singular, present)
8. have (plural, present)
9. remarks (singular, present)
10. believes (plural, present)
11. looks (singular (the team is one object), present)
12. subscribe (plural, present)