1.本课核心句有What are they doing? They are cooking. What are they doing? They are sleeping. What are they doing? They are shaving.What are they doing?They are crying。
2.本课核心句有What are they doing?They are eating.What are they doing?They are typing.What are they doing?They are doing homeworks.What are they doing?They are washing dishes.
3.本课核心句有What are they doing?They are flying in the sky.What are they doing?They are walking on the bridge.What are they doing?They are waiting for the bus.
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