I didn't swim in the sea yesterday.
I didn't play on the beach yesterday.
I didn't go on a trip to the sea yesterday.
I didn't do London yesterday.
I didn't stay at a hotel yesterday.
I didn't make sandcastles yesterday.
I didn't read French books yesterday.
I didn't visit Trafalgar Square yesterday.
I didn't go to the British Museum yesterday.
I didn't go boating yesterday.
I didn't stay at home all day yesterday.
I didn't teach little children to swim yesterday.