The weather was too unpleasant for us to go on a picnic. A. It wasn't very unpleasant weather and we could go on a picnic. B. The weather was so unpleasant that we couldn't go on a picnic.

It wasn't very unpleasant weather and we could go on a picnic.

The weather was so unpleasant that we couldn't go on a picnic.

It was such unpleasant weather that we could go on a picnic.

The weather was unpleasant enough for us to go on a picnic.