Hi! That's an interjection. :)
Interjections like er and um are also known as
"hesitation devices". They are extremely common in English. People use them when
they don't know what to say, or to indicate that they are thinking about what to
say. You should learn to recognize them when you hear them and realize that they
have no real meaning.
| interjection | meaning | example |
| ah | expressing pleasure | "Ah, that feels good." |
| expressing realization | "Ah, now I understand." | |
| expressing resignation | "Ah well, it can't be heped." | |
| expressing surprise | "Ah! I've won!" | |
| alas | expressing grief or pity | "Alas, she's dead now." |
| dear | expressing pity | "Oh dear! Does it hurt?" |
| expressing surprise | "Dear me! That's a surprise!" | |
| eh | asking for repetition | "It's hot today." "Eh?" "I said it's hot today." |
| expressing enquiry | "What do you think of that, eh?" | |
| expressing surprise | "Eh! Really?" | |
| inviting agreement | "Let's go, eh?" | |
| er | expressing hesitation | "Lima is the capital of...er...Peru." |
| hello, hullo | expressing greeting | "Hello John. How are you today?" |
| expressing surprise | "Hello! My car's gone!" | |
| hey | calling attention | "Hey! look at that!" |
| expressing surprise, joy etc | "Hey! What a good idea!" | |
| hi | expressing greeting | "Hi! What's new?" |
| hmm | expressing hesitation, doubt or disagreement | "Hmm. I'm not so sure." |
| oh, o | expressing surprise | "Oh! You're here!" |
| expressing pain | "Oh! I've got a toothache." | |
| expressing pleading | "Oh, please say 'yes'!" | |
| ouch | expressing pain | "Ouch! That hurts!" |
| uh | expressing hesitation | "Uh...I don't know the answer to that." |
| uh-huh | expressing agreement | "Shall we go?" "Uh-huh." |
| um, umm | expressing hesitation | "85 divided by 5 is...um...17." |
| well | expressing surprise | "Well I never!" |
| introducing a remark | "Well, what did he say?" |
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