The use of do, does and did in relation to time

The use of do, does, and did in relation to time depends on the tense of the sentence and whether the subject is singular or plural.

1. Present Tense:
- Singular Subject: Use "does" - He does his homework every day.
- Plural Subject: Use "do" - They do their chores on weekends.

2. Past Tense:
- Singular Subject: Use "did" - She did her laundry yesterday.
- Plural Subject: Use "did" - We did our groceries last week.

3. Future Tense:
- Singular or Plural Subject: Use "will do" - They will do their shopping tomorrow.

These are general guidelines, but keep in mind that verb usage can vary depending on the sentence structure and the specific verb being used.