Here is a list of interjections with meanings and example sentences. This list does not include all interjections but it does show the more common ones.

interjectionmeaningexample
ahexpressing pleasureAh, that feels good.
expressing realizationAh, now I understand.
expressing resignationAh well, it can't be helped.
expressing surpriseAh! I've won!
alasexpressing grief or pityAlas, she's dead now.
dearexpressing pityOh dear! Does it hurt?
expressing surpriseDear me! That's a surprise!
ehasking for repetitionIt's hot today. / Eh? / I said it's hot today.
expressing enquiryWhat do you think of that, eh?
expressing surpriseEh! Really?
inviting agreementLet's go, eh?
erexpressing hesitationLima is the capital of...er...Peru.
Godexpressing anger, surprise, worry [some people may consider this offensive]God, what a negative attitude you have.
hello, hulloexpressing greetingHello John. How are you today?
expressing surpriseHello! My car's gone!
heycalling attentionHey! look at that!
expressing surprise, joy etcHey! What a good idea!
hiexpressing greetingHi! What's new?
hmmexpressing hesitation, doubt or disagreementHmm. I'm not so sure.
oh, oexpressing surpriseOh! You're here!
expressing painOh! I've got a toothache.
expressing pleadingOh, please say "yes"!
OKexpressing agreementOK. I'll tell her.
ouchexpressing painOuch! That hurts!
uhexpressing hesitationUh...I don't know the answer to that.
uh-huhexpressing agreementShall we go? / Uh-huh.
um, ummexpressing hesitation85 divided by 5 is...um...17.
wellexpressing surpriseWell I never!
introducing a remarkWell, what did he say?
wowexpressing amazementWow! What a cool car you've got!

sources : Original Link