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.