I’ve forgotten my password, so I can’t read my email.
1 Paul was an hour late. He missed the train. (because)

2. I borrowed your lawn mower. You weren’t using it. (as)

3. We had no electricity during the storm. We had to use candles. (so)

4. He needed a good mark. He studied hard for the test. (Since)

5. It’s raining. We have decided to stay at home. (As)