I ofent hear birds ____(sing) songs in the tree in the morin

I ofent hear birds ____(sing) songs in the tree in the morin Listen!Can you hear birds（ ）in the tree?A.sing B.to sing C.s ____ are the birds doing?The birds are sing in the tree.选Whe 改正下列句子的错误1.I hear the birds sing in the tree.2.They play com Can you hear birds _____(sing)in the tree outside the window In spring,we can hear birds -----(sing) in the trees Listen!The birds _____(sing) in the tree. Look,the birds ______(sing) in the tree. Listen,the birds ________________ (sing) in the tree 适当形式填空 Listen,the birds in the tree (sing) Can you hear the birds sing in the morning? Listen!There are some birds ____ in the tree.(用sing的适当形式填空)怎