She won't go to bed until she_____(finish)____(do)her homework.

问题描述:

She won't go to bed until she_____(finish)____(do)her homework.

finishes 因为not...until是直到…才,译为直到她写完作业才能够出去.
并且此句为条件状语从句,所以是主将从现,意思是,主句为将来时,从句为现在时,而She是第三人称单数,所以finish要加es,
doing
finish doing sth 为固定搭配

finishes doing