请问Lily likes singing.sing后面为什么加ing

请问Lily likes singing.sing后面为什么加ing Does your father singing?sing为什么要加ing? singing in the rain sing为什么要加ing? we sat around singing songs.为什么sing要加ing? Tom likes swimming后面为什么要双写M加ing He likes cats.为什么cat 后面不用加,ing 英语翻译Lily likes singing.Lily likes drawing.Lily likes dancing likes后面要不要加动词ing? 为什么like后面加ing 为什麼sing后面还可以加ing呢? she likes swimming 为什么要加ing He heard someone singing in the next room.请问这里的宾补sing为什么加的是i