8上上Unit2知识知识点点课件课件Welcome to the unit Why dont?和和Why not?用以提出用以提出建议。建议。“为什么为什么不不”Why dont?后接主格人称代词或相当后接主格人称代词或相当于名词的词,然后再接动词原形;于名词的词,然后再接动词原形;Why not?后跟动词原形后跟动词原形。1.Why dont dogs go to school,Eddie?你为什么不做作业?你为什么不做作业?_ _ _ /_ _ do your homework?(同义句同义句)Why dontyou Why not表示建议的句型还有:表示建议的句型还有:What/How about-?/Lets-,shall we?/Shall we-?Would you please-?Would you like to do-?Youd better do sth.如:我们为什么不好好睡一觉呢?如:我们为什么不好好睡一觉呢?_ _ _ _ a good sleep?_ _ _ a good sleep?_ _ _ a good sleep?_ _ a good sleep,_