Translating English to Chinese

1. He played football for four years in Spain.
他在西班牙踢了4年足球。

2. He played football for three months in Italy.
他在意大利踢了3个月足球。

3. He spends a lot of money on cars.
他在汽车上花很多钱。 What you wrote means that "his car spent a lot of money"

4. He spends a lot of money on houses.
他家花很多钱。 "His family spends a lot of money"!  At the same time, "他在屋子上花了很多钱" is not quite natural in Chinese.  We would add something like spending a lot of money on remodelling the place etc".  他花了很多钱来改造 房子.

5. His influence on young people is very big.
他对年轻人的影响是很大的。 or simply, 他对年轻人有很大影响力

6. He likes to do things for young people.
他喜欢做的事情为年轻人做事。

7. They want to try as hard as Beckham.
他们要尝试最硬跟Beckham一样这么努/勤力。