1.isn't there.(反意疑问句的肯否并存原则)
2.is there ,(因为nothing 本身具有否定意义)
hear sb do 表示听的过程
hear sb doing 表示听到的一时的动作,如
I heard Lily sing the song yesterday.
I heard lily singing the song when I passed by .
1.isn't there.(反意疑问句的肯否并存原则)
2.is there ,(因为nothing 本身具有否定意义)
hear sb do 表示听的过程
hear sb doing 表示听到的一时的动作,如
I heard Lily sing the song yesterday.
I heard lily singing the song when I passed by .