Swallows fly to the south before winter comes"he says.

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