Since it's not the rainy season, there's no need for an umbrella.
"Oh no! I left my umbrella on the train." "You are a scatterbrain!"
You had better take your umbrella in case.
Perhaps I should take an umbrella with me just in case.
I'm very sorry, but I seem to have lost your umbrella.
I am always leaving my umbrella on the train.
Don't forget to take an umbrella with you.
Mother bought my brother a yellow umbrella.
Father never goes out with an umbrella without leaving it somewhere.
She put a red ribbon on her umbrella as a mark.
She took my umbrella without so much as asking me.
She shut an umbrella and began to run.
She has left her umbrella behind.
She was holding an umbrella.
She may have left her umbrella on the bus.
She left her umbrella on the bus.
She was in such a hurry that she left her umbrella behind on the train.
She put up an umbrella against a scorching sun.
She was holding an umbrella.
I held the umbrella over her.