1、hard-working是形容詞，後面加名詞，例如： Chinese people is a hard-working people.；adj.勤勉的，努力工作的；
2、hard work 是名詞短語，意思是努力工作、繁重的工作。hard 在這裡是形容詞。；例如：He ascribed his success to hard work. 他把自己的成就歸功於努力工作。；
3、work hard是動詞短語 意思是工作努力。hard 在這裡是副詞，修飾動詞工作。例如：He works hard. 他工作勤奮。；擴充套件資料：；例句；（1）I remember her as a quiet, hard-working and well-spoken girl. ；我記得她是個安靜、勤奮並且談吐優雅的女孩子。；（2）We are looking for someone who is reliable and hard-working. ；我們在物色可靠而又勤奮的人。；（3）I admire their hard - working spirit. ；我欽佩他們的苦幹精神.；（4）He ascribed his success to hard work. ；他把自己的成就歸功於努力工作。；（5）After years of hard work, she has finally arrived in her field. ；經過多年的努力工作之後她終於在她的領域功成名就了；（6）I work hard to keep that trust. ；我為了保持這種信任努力工作。
hard-working 和 hardworking沒有區別，這兩個詞的意思都是勤奮的、努力工作的，是形容詞詞性。容易混淆的是hard-working 、hard work、work hard。區別如下：；
1、hard-working是形容詞，後面加名詞，例如： Chinese people is a hard-working people.；adj.勤勉的，努力工作的；
2、hard work 是名詞短語，意思是努力工作、繁重的工作。hard 在這裡是形容詞。；例如：He ascribed his success to hard work. 他把自己的成就歸功於努力工作。；
3、work hard是動詞短語 意思是工作努力。hard 在這裡是副詞，修飾動詞工作。例如：He works hard. 他工作勤奮。；擴充套件資料：；例句；（1）I remember her as a quiet, hard-working and well-spoken girl. ；我記得她是個安靜、勤奮並且談吐優雅的女孩子。；（2）We are looking for someone who is reliable and hard-working. ；我們在物色可靠而又勤奮的人。；（3）I admire their hard - working spirit. ；我欽佩他們的苦幹精神.；（4）He ascribed his success to hard work. ；他把自己的成就歸功於努力工作。；（5）After years of hard work, she has finally arrived in her field. ；經過多年的努力工作之後她終於在她的領域功成名就了；（6）I work hard to keep that trust. ；我為了保持這種信任努力工作。