比较级是closer，最高级是closest，例如：

1.But actually, the country is closer to his proposal than you might think.但事实上,这个国家比你想象得更接近他的提议。

2.We would like to see closer cooperation between parents and schools.我们希望学生家长和学校有更加紧密的合作。

3.This is the closest we can get to the beach by car.开车去海滩到了这儿就再也不能往前走了。