【导学过程】
1. As usual, they sat under the big tree.
as usual 像平常一样，照例 As usual he got up very early.
As usual 像往常一样 usually （副词）反义词 unusual（不寻常的，不平常的）
英语中，形容词加前缀un构成反义词的例子有：
happy——unhappy pleasant（愉快的）——unpleasant fair（公平的）——unfair lucky——unlucky healthy——unhealthy important（重要的）——unimportant
2. Suddenly, they heard a whisper from the bushes behind the tree.
1） hear “听见”“听到”，强调结果。
