Viết lại câu sao cho nghĩa không đổi: 1) Lan is the youngest of the three sisters. 2) There are eight hundred stamps in Hoa's collection. 3) Tom will be twenty next week

1. Lan is the youngest of the three sisters.
2. There are eight hundred stamps in Hoa's collection.
3. Tom will be twenty next week.
4. Mr.Cuong plays table tennis well.
5. Lan is more intelligent than her sister. » Lan's sister isn't ...
6. When my mother was ill, I looked after her.