Complete sentences with the correct tense form 1. They ... (to do) their homework at the moment
2. ... (to watch) that film yesterday?
3. She ... (to clean) her room every day
4. When ... (to visit) your grandparents for the last time?
5. Usually I ... (to have) 5 lessons every day?
6. ... (to go) to the see next summer.

1. They are doing their homework at the moment.
Explanation: We use the present continuous tense to talk about actions that are happening right now, at the moment of speaking.

2. Did you watch that film yesterday?
Explanation: We use the past simple tense to talk about actions that happened and were completed in the past. The word "did" is used to form questions in the past simple tense.

3. She cleans her room every day.
Explanation: We use the present simple tense to talk about habits or repeated actions. The word "every day" indicates that cleaning the room is a regular occurrence.

4. When did you last visit your grandparents?
Explanation: We use the past simple tense to talk about actions that happened and were completed in the past. The word "last" indicates that the action of visiting grandparents happened at a specific point in the past.

5. Usually, I have 5 lessons every day.
Explanation: We use the present simple tense to talk about general truths, habits, or routines. The word "usually" indicates that having 5 lessons every day is a regular occurrence.

6. I will go to the sea next summer.
Explanation: We use the future simple tense (with the verb "will") to talk about future actions. The word "next summer" indicates that the action of going to the sea will happen in the future.