Помогите мне пожалуйста по британскому языку надобно составить правильное предложение

2 My sister is younger than me
3 Who is the oldest in the class?
4 Concorde is the fastest passenger plane in the world
5 My book is more interesting than your book
6 Peter bought the most expensive watch in the shop
7 Did you buy the cheapest watch in the shop?
8 English is much more difficult than German
9 The weather is much better today than yesterday

My sister is younger than me. Who is the oldest in the class? Concorde is the fastest passenger plane in the world. My book is more interesting than your book. Peter bought the most expensive watch in the shop. Did you buy the cheapesy watch in the shop? English is much more difficult than German. The weather is much better today than yesterday.