nearly 确实是副词，但有一些特殊的用法：
nearly adv. [尤英]几乎，差不多
常与数字连用，表示在数量、时间、面积等方面的接近；与副词、动词等连用时，多表示程度上的接近，但并非与名词连用。
The sea covers nearly three-fourths of the world's surface.
海洋几乎占地球表面的四分之三。
It was nearly six o'clock.
快6点钟了。
She was nearly drowned.
她差点儿被淹死。
I've worked here for nearly two years.
我已经在这里工作了将近两年。
It's nearly time to leave.
快该走了。
The audience was nearly all men.
观众几乎全都是男的。
He's nearly as tall as you are.
他差不多和你一样高了。
They're nearly always late.
他们几乎总是迟到。
She very nearly died.
她差点儿死了。
