1·The weather got so bad that we had to turn back.
天气变得非常恶劣,我们不得不循原路折回。
—— 《牛津词典》
2·The weather became so bad that they had to turn back.
天气变得非常恶劣,他们不得不循原路折回。
3·We cannot turn back.
我们不能够折回。