1. When I was ten, I began to play football.

2. I think skating is more interesting than mountain-climbing.

3. I don't know why my mother cooks.

4. He likes collecting books whenever he has money.

5. How many paintings did she painted?

I. Make up sentences using the words and phrases given
1. When/I/ten/begin/play football

When I was ten, I began to play football.
2. I/think/skate/more/interesting/mountain-climbing

I think skating is more interesting than mountain-climbing.
3. I/not/know/why/my mother/cook

 I don't know why my mother cooks.
4. He /collect/books/whenever/have/money

He likes collecting books whenever he has money.
5. How many/paintings/she/ paint
How many paintings did she painted?