呵
呵 can be an interjection or a modal particle. Let’s look at both of them.
Interjection 呵
The interjection 呵 
expresses amazement, fright or admiration. It can be translated as “oh”, “ah”, “oh, God”.
expresses amazement, fright or admiration. It can be translated as “oh”, “ah”, “oh, God”.
Pay attention
An interjection (感叹词) is a word or expression that occurs as an utterance on its own and expresses a spontaneous feeling or reaction. It expresses feelings and emotions but does not name them. It is usually placed at the beginning of a sentence.
Examples
呵！来了这么多人！
Oh! So many people have come!
hē! lái le zhème duō rén
呵，是你！
Ah! It’s you!
hē, shì nǐ
呵，天哪！看是谁在这儿
Oh, God! Look who's here
hē, tiān nǎ! kàn shì shéi zài zhèr
Particle 呵
The 啊 particle is used as an exclamation.
particle is used as an exclamation. Pay attention
A modal particle (语气词) is a function word that adds additional semantic meanings to the sentence or emotionally colors it. It is usually placed at the end of a sentence.
Examples
这么多钱呵！
So much money!
zhème duō qián а
你们这里好热情呵！
You guys are so enthusiastic here!
nǐmen zhèlǐ hǎo rèqíng a
娘呵，儿回来了！
Mommy! Your son is back!
niáng а, ér huílái le
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