1. I usually ____ (to play) chess with my brother on Sundays.

Решение:

Для заполнения пропусков нужно правильно проспрягать глаголы в соответствии с подлежащим и временем. В данном случае, судя по словам "on Sundays", "yesterday", "next Sunday", "last week", "tomorrow", "every day", "two days ago", "next Monday", "last summer", мы имеем дело сPresent Simple, Past Simple и Future Simple.

• 1. I usually play chess with my brother on Sundays. (Present Simple, "usually" указывает на регулярность)
• 2. My sister cleaned her room yesterday. (Past Simple, "yesterday" указывает на прошедшее время)
• 3. Tom will visit his grandma next Sunday. (Future Simple, "next Sunday" указывает на будущее время)
• 4. They were at the zoo last week. (Past Simple, "last week" указывает на прошедшее время, "be" в Past Simple для "They" - "were")
• 5. She will buy a new doll tomorrow. (Future Simple, "tomorrow" указывает на будущее время)
• 6. He helps his dad every day. (Present Simple, "every day" указывает на регулярность)
• 7. We always watch cartoons in the evening. (Present Simple, "always" указывает на регулярность)
• 8. I saw a big elephant two days ago. (Past Simple, "two days ago" указывает на прошедшее время)
• 9. You will have five lessons next Monday. (Future Simple, "next Monday" указывает на будущее время)
• 10. We were in the country last summer. (Past Simple, "last summer" указывает на прошедшее время, "be" в Past Simple для "We" - "were")

Ответ:

1. I usually play chess with my brother on Sundays.
2. My sister cleaned her room yesterday.
3. Tom will visit his grandma next Sunday.
4. They were at the zoo last week.
5. She will buy a new doll tomorrow.
6. He helps his dad every day.
7. We always watch cartoons in the evening.
8. I saw a big elephant two days ago.
9. You will have five lessons next Monday.
10. We were in the country last summer.