HELP ME. SOS

1.Open the brackets:

1.My brother (clean) his car now.

2.She (do) already her homework.

3.He (buy) this house last week.

4.We (swim) at that time yesterday.

5.He (help) his parents every weekend.

6.They (build)a new house in two years.

II: Put in passive voice:

2.My mum cleans our flat on Saturdays.

3.Paul will buy a bike next year.

1.He sent the letter last month.​