It was raining, therefore we stayed indoors.

As a result; for that reason.
She studied hard, therefore she passed the exam.
He was late, therefore he missed the bus.
They were tired, therefore they went to bed early.
therefore it follows
therefore we conclude
therefore I suggest
consequently
accordingly
as a result
It was raining; therefore, we stayed inside.

For that reason; as a result.
She studied hard; therefore, she passed the exam.
He forgot his umbrella; therefore, he got wet.
The store was closed; therefore, we went home.
therefore it follows
therefore we conclude
therefore we must
consequently
as a result
thus