写过去式?
问题描述：
写过去式?
is[ ] are[ ] worr[ ] bug[ ] eat[ ] drinr[ ] do[ ] have[ ] learn[ ] go[ ] teach[ ] dance[ ] give[ ] live[ ] coor[ ] study[ ]
答
is-----was are-----were worry-----worried eat------ate do------did have----had learn------learned go-------went teach------taught dance------danced give------gave live-------lived study------studied