there are some boys( )(swim)in the river
there are some boys ----(swim) in the pool
some boys are s__ in the river
there are some ducks in the river
There are many boys_____(swim) in the river now.适当
The boys are swimming in the river
There( )some( )in the river
They (swim;are swimming)in the river
Are they---------(swim)in the river now?
there are some boys swimming in the pool
look,there are some boys ( have) fun in the ball
There are some boys in the classroom 改为否定句
改为否定句:There are some boats in the river.