Can you hear birds _____(sing)in the tree outside the window?

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Canyouhearbirds_____(sing)inthetreeoutsidethewindow?Canyouhearbirds_____(sing)inthetreeoutsidethewin

Can you hear birds _____(sing)in the tree outside the window?
Can you hear birds _____(sing)in the tree outside the window?

Can you hear birds _____(sing)in the tree outside the window?
singing
hear 后面的动词有两种形式,一是ing,二是不定式.
加ing表示正在进行的动作,加不定式表示听到某事的过程
所以这里用singing更适合

singing,表示现在正在经行的动作