The weather was bad on Sunday - so we couldn’t go to the park.
Mum didn’t have the key - so she couldn’t get into the house.
I didn’t have a bike - so I couldn’t learn to ride it.
Granddad lost his glasses - so he couldn’t read the book.
I didn’t have any vegetables at home - so I couldn’t make a salad.
They missed the last train - so they couldn’t get home on time.
The supermarket was closed - so we couldn’t buy any bread.
The boy was very lazy - so he couldn’t study well at school.