1. We take our umbrellas because it is raining heavily.
-> It is raining heavily, so we take our umbrellas.

2. I can't remember the answers to these questions.
=> I wish I could remember the answers to these questions.

3. "Let's go out for dinner," Mary said.
=> Mary suggested going out for dinner.

4. It's two years since I last spoke to her.
=> I haven't spoken to her in two years.

5. They have just opened a new supermarket in our town.
=> A new supermarket has just opened in our town.