Dialogue
Mother,can you buy me a new bike?
No,Sam,I can't
But all my friend have new bicycles.
You can ride their bikes.
Why can't I have a new bike?
Because money doesn't grow on trees.
Key Points
buy+人+物 买某物给某人
= buy +物 + for + 人
Romeo buys his wife flowers every day.
=Romeo buys flowers for his wife every day.