"But/ Even though"
I like school.
It gets boring sometimes.
I like school but it gets boring sometimes.
The dog started barking loudly.
The mailman came to the door.
The dog started barking loudly because the mailman came to the door.
She was couldn't find her keys.
She wasn't too happy.
She couldn't find her keys and she wasn't too happy.
The movie was really good.
It was too long.
The movie was really good but it was too long.
It's cold outside.
I'll put on a sweater.
I'll put on a sweater because it's cold outside.
Since it's cold outside, I'll put on a sweater.
I don't know the answer.
It's confusing me.
I don't know the answer and it's confusing me.
She was excited.
She was nervous.
She was excited but she was nervous.
The artist was disappointed.
They didn't win the competition.
Since they didn't win the competition, the artist was disappointed.
The artist was disappointed because they didn't win the competition.
Where did he go?
Why did he leave?
Where did he go and why did he leave?