Let you, beat you

[Nightmare85]

Hello,
How would you pronounce these sentences (the marked parts)?
I will never let you down.
I will beat you up.
You can beat him up.

I like to say it this way:
[letchu]
[beatchu]
[beatchim] -> although it sounds strange

I often hear such pronunciation in songs.
Is it very uncommon, or is it normal?
Does it belong to slang?

Thanks

Cheers!

[billmcd]

OK except "beat him" = "beatim". Not uncommon in any language to "blend" two or more words.

[areev]

Hello,
How would you pronounce these sentences (the marked parts)?
I will never let you down.
I will beat you up.
You can beat him up.

I like to say it this way:
[letchu]
[beatchu]
[beatchim] -> although it sounds strange (I'm not sure)

I often hear such pronunciation in songs.
Is it very uncommon, or is it normal?
Does it belong to slang?

Thanks

Cheers!

NOT A NATIVE SPEAKER

maybe, You're right !
I think they're not slang.
just check them all in www.slangsite.com

[Raymott]

Hello,
How would you pronounce these sentences (the marked parts)?
I will never let you down.
I will beat you up.
You can beat him up.

I like to say it this way:
[letchu]
[beatchu]
[beatchim] -> although it sounds strange

I often hear such pronunciation in songs.
Is it very uncommon, or is it normal?
Does it belong to slang?

Thanks

Cheers!

This comes under the category of "speech sounds that occur normally when you speak the language spontaneously". An attempt to artificially duplicate such natural inclusions and omissions usually leads to less clear language - to me at least.
Many people actually say "letyou" and rarely "letchu".

My point is that a person with a German accent (for example) who says "letyou" will be more understandable than one who says "letchu", unless s/he has achieved a level of spoken English in which "letchu" becomes a natural unselfconscious production of speech.