shack|shacked|shacking

工人们在工地旁边搭了一个简陋的小屋休息。

The workers built a small ___shack near the construction site for resting.

他们虽然同居了两年，但还没打算结婚。

They've been ___shacked up for two years but have no plans to marry.

他们毕业后就同居了，但并没有结婚的计划。

After graduation, they started ___shacking up without any plans to get married.