He likes cats.为什么cat 后面不用加,ing

He likes cats.为什么cat 后面不用加,ing He likes cats.cat后面不加,ing 英语My dog likes chasing cats为什么chase要加ing My little brother likes cats.He often___a little cat Tom likes swimming后面为什么要双写M加ing 请问Lily likes singing.sing后面为什么加ing He likes to walk home.walk为什么不加ing he likes watching tv 为什么watch加ing He likes reading.这里read为什么要加ing? he likes reading .为什么read要加Ing? likes后面要不要加动词ing? can后面动词用不用加ing?