Sure, I can help rewrite the sentences. Here are the rewritten sentences based on the prompts provided:

1. **We went to bed that we were tired (so):**
- We were so tired that we went to bed.

2. **The test is difficult. They can't do it (too):**
- The test is too difficult for them to do.

3. **The weather was cold. She couldn't go swimming (such):**
- It was such cold weather that she couldn't go swimming.

4. **Tom drives very carelessly, so he often causes accidents (so):**
- Tom drives so carelessly that he often causes accidents.

5. **The girl is very intelligent. She can understand what you're saying (enough):**
- The girl is intelligent enough to understand what you're saying.

6. **The sound is very low. He can't hear it (too):**
- The sound is too low for him to hear.

7. **The room is so tidy that it took us only 10 minutes to clean (such):**
- It is such a tidy room that it took us only 10 minutes to clean.

8. **He was so weak that he couldn't drive to work (enough):**
- He wasn't strong enough to drive to work.