Children are forbidden ------ in the river.A swimming

Children are forbidden ------ in the river.A swimming the children are swimming in the river对画线部分提问 The boys are swimming in the river _____ fish are swimming in the river. They (swim;are swimming)in the river 是The ducks are swimming on the river 还是in the river?是There a The children are swimming( ) the river.(填介词） The children are swimming in the l____. The fish ____(is /are)swimming in the river. the fish are swimming 画线in the river 画线提问 They are swimming in the river是什么句型? they are swimming ____(happy) in the river