幸好你今天早上带了伞。

___It ___is ___a ___good ___job that you had your umbrella with you this morning.

幸好她在我们出发前查了火车时刻表。

___It ___is ___a ___good ___job she checked the train times before we left.

幸好停电时备用系统运转正常。

___It ___was ___a ___good ___job the backup system worked during the power outage.