初一水平句子中译英。请帮我翻译成英文，谢谢！

Question

他在一家外资企业工作已经10年了。（现在完成时）
2010年回国之前，他在美国工作。（过去完成时）
2010年回国之后，他一直在当保安。（过去完成时）

Answer 1

He has worked in a foreign company for 10 years.

He had worked in America before he returned home in 2010.

He worked as a security guard since he returned home in 2010.

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Answer 2

He Has worked in a foreign-owned company for 10 years.
he had worked in USA beforehis return in 2010.
he had been a safeguard before his return in 2010.

Answer 3

1 He has worked in a foreign company for ten years.
2 Before he returned in 2010, he worked in US.
3 Before his return in 2010, he had worked as a security guard.

Answer 4

He has worked in a foreign company for 10 years.
He had worked in America before he returned home.
He has been working as a security guard since he returned home.

Answer 5

He has worked in a foreign enterprise for ten years.
He had worked in America before returning to China in 2010.
He had worked as a guard since he back to China in 2010.