Swallows fly to the south before winter comes .中文,为什么用comes而

Swallows fly to the south before winter comes .中文,为什么用comes而 Swallows fly to the south before winter comes"he says. Swallows fly to the south before winter ( ) Swallows fly to the south before winter_____ When autumn comes,swallows go to the south. When winter comes,some girds will fly to the south,__will st 初三英语习题The swallows know when __to fly __ south.为什么填 to fly , In winter ,some birds fly to the south 为什么要用fly啊. 连词成句.swallows ,in ,fly ,will,autumn ,to,south,the Some birds ( )to the south before winter Comes to the answers 中文 winter comes 为什么 come要用复数