hard的比较级和最高级分别为harder和hardest。hard可以作为形容词和副词，作形容词时，意为“坚固的”、“结实的”、“难懂的”、“艰苦的”；作副词时，意为“努力地”、“猛烈地”、“彻底认真地”。
一、hard的基本释义及用法介绍
1、当hard作为形容词时，中文翻译为坚固的;坚硬的;结实的;难做的;难懂的;难以回答的;困苦的;艰苦的;艰难的。其比较级为harder，最高级为hardest。
例句：Wait for the concrete to go hard.
等待混凝土凝结。
It's hard to see how they can lose.
很难理解他们怎么会输。
Times were hard at the end of the war.
战争后期生活很艰苦。
It's hard work shovelling snow.
铲雪是个苦活儿。
He's hard at work on a new novel.
他正努力忙着写一本新小说。
He gave the door a good hard kick.
他狠狠踢了一下门。
He said some very hard things to me.
他对我说了些很不近人情的话。
2、当hard作为副词时，中文翻译为努力地;费力地;艰难地;猛力地;猛烈地;彻底认真地。其比较级为harder，最高级为hardest。
例句：He was still breathing hard after his run.
他跑完步，现在还气喘吁吁的。
We thought long and hard before deciding to move house.
我们经过长久慎重的考虑之后才决定搬家。
It was raining hard when we set off.
我们出发时正下着大雨。
