Question

They+built+a+house+2+years+ago同义句？

Answer 1

They built a house two years ago.
两年前他们建了一间房子。
同义句是
A house was built by them two years ago.

Answer 2

They put up a house 2 years ago. 他们两年前盖了一所房子。
They finished building a house two years ago. 他们两年前盖完了一所房子。
A house was built two years ago by them. 他们两年前盖了一所房子。