Here are the corrections for each sentence:

1. **Incorrect:** "I usually don't play soccer with my friends in the park."
**Correction:** "I usually play soccer with my friends in the park." (The "don't" indicates a negative statement, which may not be the intended meaning.)

2. **Incorrect:** "Are these students often go swimming after school?"
**Correction:** "Do these students often go swimming after school?" (The correct auxiliary verb "do" is needed here.)