I like swimming in the river .（把主语换成he ) There is a desk in

I like swimming in the river.本意为：我喜欢在河里游泳.
要把主语换为“第三人称单数”的他,故应把like该为likes
（此处like是动词喜欢,一般换人称是改变动词）
例如：I like flowers.(我喜欢花）
He likes flowers(他喜欢花）
改句：He likes swimming in the river.
There is a desk in the room .本意为：在房间里有一个桌子.
这句是"There be"句型（be即为am,is,are中任意一个因时态而定）
故应把is改为are.
又因为a desk（一个桌子）为单数,要把其改为复数去a加s：desks
改句：There are desks in the room.（或There are some desks in the room.）{这有一些桌子在房间里}
如果还有什么问题可以继续问我(*^__^*)
study harder!