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Why?
No,they can't.
Because the baby is sleeping.
Can Sam climb the tree? Why?
No, he can't.
Because it's dangerous.
Can Amy walk on the grass?
No,she can't.
否定祈使句的用法:
Don’t shout,please!此句为否定祈使句，否定祈使句在句首加Don’t,意为“不要”，它的句首或句尾加上please，可以表示礼貌和客气。
否定句的一般形式：
Don’t+动词原形+其他
Say the sentences .Don't...
climb the tree
walk on the grass
shout
swim in the lake
Teacher often tells us, “Don’t…”
shout
run
ride a bike
climb the tree
√
√
×
×
×
×
We can... Don't ...
we can say: