Teaching goals:
1. Words &phrases: how often , hardly , twice , once , difference , look after , although ,etc .
2. Learn to talk about how often do you do things .
3. 一些表示频率的副词: always , usually , often , never , hardly ever , sometimes .
4. 句子结构: What do you usually do on weekends ?
How often ··· ?及回答.
