I often play the guita.改为否定句

I often play the guita.改为否定句 I often play cards.改为否定句 you can play the guita in the garden 改为祈使句 I can play soccer in the rain.改为否定句! I play sports in the morning.(改为否定句) Helen often play the piano at the weekends改为否定句 I often play soccer after school改为否定句与一般疑问句. I can play piano.(改为否定句 he often play football after school (改为否定句) They often play football after clsaa（改为否定句） 将下列句子改为否定句1、The boys often play in the playground.2、David le I often play soccer改成否定句怎么改,为什么.