You mustn't put the medicine ----children's reach.为什么天within ,In 为什么不对,

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You mustn't put the medicine ----children's reach.为什么天within ,In 为什么不对,
You mustn't put the medicine ----children's reach.为什么天within ,In 为什么不对,

You mustn't put the medicine ----children's reach.为什么天within ,In 为什么不对,
within...reach means easily available,在可及范围内；容易得到,固定搭配.所以只能用within.

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当表示“在某个具体距离之内“时只能用within.
Please stay within hearing.
请不要跑到叫得应的距离以外去。
We live within earstot of the factory whistle.
我们住的地方听得见工厂汽笛声。
而在表示范围和引导抽象名词，两者都可使用，意思有些区别，within比in语气更强。
Success is within our grasp now.
成功在望。
in one's power，in one's grasp，etc．
within one''s power，within one''s grasp；etc．
比较：
It is in my power．这在我的职权范围之内。（说明事实）
It is within my power．这在我的控制之下。（说明控制）

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You mustn't put your bike in the corner的同意句怎么改? You mustn't put the medicine ----children's reach.为什么天within ,In 为什么不对, You mustn't put these things into the blender的祈使句 You mustn't put sugar on bread.改为同意句（）（）sugar on the bread. May I put my bag here?No,you( ).You shouMay I put my bag here?No,you( ).You should put it up on the shelf A won't B wouldn't C mustn't D shouldn't can和must的区别?------(Can;Must) I put my badminton racket on the bed?—No,you mustn't. you mustn't walk ong the grass. you mustn't cross the road now! You mustn't talk in the class. You mustn't ()(run)in the classroom. you must keep off the grass; you mustn't pick the flowers; you mustn't litter. Put it down ,Rachard .You mustn't read （anyone's else's）原因 You mustn't play football on the road改为祈使句 you mustn’t play football in the street.改成祈使句 you mustn't play on the road,--- 反意疑问句 You mustn't talk loudly in the cinema.(改为祈使句) you mustn't cross the road now否定祈使句原因 You mustn't talk loudly in the cinema改为祈使句.