Jerry goes swimming at every day ( Present simple)

С именами, означающие he, she, it всегда к смысловому глаголу добавляется окончание s/es 

2. First, cut the tomatoes and cucumbers into pieces.

3. Cut the cheese into large cubes and put it into the bowl, too.

4. Second, open the tin of olives.

5. Put all the vegetables and olives in a large bowl.

6. Last, add some salt, pepper, vinegar and olive oil.

7. Enjoy your meal!