1.   I forgot my umbrella and got drenched.

2.   It was pouring with rain and she had forgotten her umbrella.

3.   The one time I forgot my umbrella was the day it rained.

4.   It was raining and we ran from the car because we forgot the umbrella.

5.   Tench politely asked her name and suggested she not forget her umbrella.

6.   Conductors who once warned riders not to forget their umbrellas now appeal for vigilance against suspicious parcels.

7.   He advises you not to forget your umbrella as well.