1) They weren't able to attend the party due to a prior commitment.

2) We weren't sure if it was going to rain, so we brought umbrellas just in case.

3) The results of the experiment weren't what we had expected.

4) The children weren't allowed to stay up past their bedtime.

5) I wasn't aware of the deadline for the project until it was too late.

6) The shop wasn't open when we arrived, so we had to come back later.

7) She wasn't feeling well, so she decided to stay home from work.

8) The guests weren't happy with the service at the restaurant.

9) They weren't used to the cold weather, having grown up in a warmer climate.

10) He wasn't convinced by their explanation and demanded further proof.