2. Mum did a lot of work last week. She has done plenty of work this week, too.
3. Our English teacher has given us one test this term. She gave us two tests last term, too.
4. My sister learned to ride the bike when she was 5. I have learned this year.
5. Tom has written many letters this month. He wrote plenty letters last month, too.
6. I have heard this song in the last hour. I didn't hear it before.
7. Susan has called her mother twice today. She called her between 12pm and 4pm.
