应该是 I think it's fun.
fun 这个词既可以是名词,也可以是形容词,fun前面如果加了形容词,例如great,就可以作为名词来用,例如:I think it's great fun.如果fun前面没有形容词,则可以把fun理解为形容词,例如:I think it's fun.但不能说:I think its fun.楼主给的例句可以合并为一句:She thinks it's fun to play sports.
应该是 I think it's fun.
fun 这个词既可以是名词,也可以是形容词,fun前面如果加了形容词,例如great,就可以作为名词来用,例如:I think it's great fun.如果fun前面没有形容词,则可以把fun理解为形容词,例如:I think it's fun.但不能说:I think its fun.楼主给的例句可以合并为一句:She thinks it's fun to play sports.