The birds (are singing) in the tree括号部分提问

I often hear birds ( )in the morning?是填to sing 还是填singi are the birds in the Where are the birds中文 There are some birds s___in the tree. there are many birds in the sky There are some birds singing( )the trees there are three birds in the (The sun is shining,birds are singing. what are the smallest birds on earth 连词成句：the flying are birds We are enjoying the birds( ).(sing) We are enjoying the birds .(sing) There are several birds in the tree.There are ()() birds in the tree. where are the birds?what are they doing? The birds are singing in the tree.对singing提问 The birds (are singing) in the tree括号部分提问 The birds are singing in the trees.翻译 Where are the birds?---(In the picture.) 考点是什么?