How many clauses?

I'm going out tonight, so I must get ready soon.

Global warming is a major problem, but it can be solved if we take action now.

Obesity is getting worse now in developing countries.

I don't know when I will be able to stop studying because I have many more exams.

It's cold outside, so I'm going to stay in.

Although cars are essential, they cause a lot of pollution, so governments must take action soon, and individuals also need to play a role.

Why were you so late?

He said that he will come to see me tomorrow.

It is important to be on time, but it is okay to be late when you have an emergency.

I felt unwell when I ate the food, so I'll probably not eat at the restaurant again, but I think my friend will.