Listen!There's someone_____(knock)at the door.

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Listen!There''ssomeone_____(knock)atthedoor.Listen!There''ssomeone_____(knock)atthedoor.Listen!There''s

Listen!There's someone_____(knock)at the door.
Listen!There's someone_____(knock)at the door.

Listen!There's someone_____(knock)at the door.
knocking罗..LZ.告诉你喔..There be+sb的话有这个句型.There be + sb doing sth..^-^以后你会经常接触到这类的句型.

knocking
因为前面用listen,表明现在有人正在敲门

knocking
someone的定语,表示正在。。。

knocking at the door...
现在进行时!

ing~
听,有人 正在 敲门

Listen!There's someone_knocking____(knock)at the door.

knocking
There be结构中一般名词后面用V-ing做状语