否定句:hecan'tpaint;shecan'tsing;ican'tdance一般疑问句:canhepaint?canshesing?canyoudance?肯定回答:yes,hecan;yes,shec激俯馆谎弋荷龟捅骇拉an;yes,ican否定:no,hecan't;no,shecan't;no,ican't以后句子之间打标点好吗?