There are having fun piaying in the water的同义句11本人现在着急用,一会就要去上学了.

他们在水里嬉戏，玩的很开心。

"There are having fun playing in the water."= 错
纠正的句子:"They are having fun playing in the water."
类似的句子:
"They are having pleasure playing in the water."
fun=pleasure; enjoyment.

They are having a good time playing in the water.
或
They are enjoying themselves playing in the water.