在建

gāi gōng chéng yǐ zài jiàn duō nián

该工程已在建多年。

The project has been years in the making.

zài jiàn jī chǎng

在建机场

airport under way

tā men zài jiàn yī zuò fáng zi

他们在建一座房子。

They were building a house.