1 Fill in ride or rides, I ride a horse at weekends.
You (mat) ride a horse at weekends.
He rides a horse at weekends.
1. She
a horse at weekends.
2. It
a horse at weekends.
3. We
a horse at weekends.
4. You (B)
a horse at weekends
5. They
a horse at weekends.​

1. She rides a horse at weekends.
Explanation: The subject "She" is used in the sentence, which is the third person singular pronoun. According to the rule of subject-verb agreement, when the subject is a singular third person pronoun, the verb should be in the form of base verb + 's' (for present simple). Therefore, the correct form of the verb "ride" is "rides" in this sentence.

2. It rides a horse at weekends.
Explanation: Similarly, when the subject is a singular third person pronoun "It", the verb should be in the form of base verb + 's'. Therefore, the correct form of the verb "ride" is "rides" in this sentence.

3. We ride a horse at weekends.
Explanation: The subject "We" is used in the sentence, which is the first person plural pronoun. For first person plural pronouns, we use the base form of the verb without any changes. Therefore, the correct form of the verb "ride" is "ride" in this sentence.

4. You (B) ride a horse at weekends.
Explanation: The subject "You" is used in the sentence, which is the second person pronoun. For second person pronouns, we use the base form of the verb without any changes. Therefore, the correct form of the verb "ride" is "ride" in this sentence.

5. They ride a horse at weekends.
Explanation: The subject "They" is used in the sentence, which is the third person plural pronoun. For third person plural pronouns, we use the base form of the verb without any changes. Therefore, the correct form of the verb "ride" is "ride" in this sentence.

Overall, we use the form "ride" for all subjects except for the third person singular pronouns (She, He, It) where we use the form "rides".