Jack is riding a bicycle in the park.(用usually改写)

Jack is riding a bicycle in the park.(用usually改写) Nick is riding a Riding a bike is exercise.为什么Riding不能用ride? Riding a bike is agood e__ Riding a bike is faster than walking.同义句：Riding a bike___ ____time ____walking. Joe is riding a bike picture 画riding a bike （对画线句子提问） which do you think is more dangerous ,riding a camel or riding a horse? What is mingming doing?He is riding a bike. jack is a four-old( ). he is a jack-leg 连词成句：riding,she,is,bicycle,a,( ) bike is a her riding hobby 连词成句 riding Lisa a is bike连词成句 The boy is（）a bicycle.riding ride rideing选择 Is the boy riding a bike?的答句 Riding a bike to school is good e_____.首字母填空 riding in mud is What do you think about riding a horse?I think riding a horse is fun.为什么回答的时候也要用riding