1. She doesn’t have enough money, so she can’t buy that book.
→ If she had enough money, she could buy that book.
2.We spent the whole day looking for these old pictures
→ It took us the whole day to look for these old pictures.
3. “Why don’t you ask Tom for help, Mary?” Ba said.
→ Ba suggested asking Tom for help Mary
4. Ba is too young to see horror films.
→ Ba is not old enough to see horror films.
@nguyễn