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2). 疑问结构：Did+主语+动词原形+其他？
Did he walk to school yesterday?
Yes, he did./No, he didn’t.
3).否定结构：主语+didn’t+动词原形+其他。
He didn’t walk to school yesterday.
3.fill in the blanks
He ___________on the door yesterday.
She ___________some flowers last weekend.
He ___________in the room last night.
They ___________a kite last weekend.
4.用法：表示在过去某个时间发生的动作。常和表示过去的时间状语连用，如：once, once upon a time, last week, in 1990, just now, yesterday, two days ago etc.
They played football last Saturday.
表示过去一段时间经常或反复发生的动作。常和表示频率的副词连用，如：always, usually, often, never等。
His father often returned home late last month.
Do exercises:
Activity 1
answer enter hurry jump like notice point return try
1. Baby bear _______at the girl in his bed.
2. She _______ the house.
3. Goldilocks ________ out of bed.
4. She _______ to the little house.
5. The Three Bears didn’t ______ the door because they were out in the forest.
6. The Three Bears didn’t ______ Goldilocks in
bed at first.
7. Goldilocks didn’t _______to that part of the forest again.
8. —Did she ______ the small chair first?
—No, she didn’t. She tried the big chair first.
9. — Did she ______ the small bed?
—Yes, she did.