Hello! I saw that some words have no letter at the end, instead of a letter - an apostrophe.
Something - somethin', laughing - laughin'
Is this grammatically correct?
This is not really anything to do with grammar. The -in' style represents a spoken pronunciation where ? is rendered as n .
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This is not really anything to do with grammar. The -in' style represents a spoken pronunciation where ? is rendered as n. Depending on context, this pronunciation may be seen as casual, regional/dialect or defective, and the reasons for writing it that way can similarly vary. Often you will see the -in' style in written dialogue, reflecting the way a person speaks
?????? ???????Something - somethin', laughing - laughin'
As GPY replied, this is a writing style called "eye dialect."
In "eye dialect" conversations, or lyrics, are written semi-phonetically.
Apostrophes can occur almost anywhere in the syllables as in this example:
Source: