It is a colloquial phrasing, because you are using "really" to mean "extremely" and "badly" to mean "desperately" or "greatly." A less colloquial form is very badly.
Yes, "she sings badly" is grammatically correct. The adverb "badly" is describing the verb "sings" in this sentence, indicating the quality of her singing.
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
Sure. It would also be grammatically correct to write He spoggled his nubbix on the goober. Grammatically correct and meaningful are not the same.
The phrase "Is you don't miss me do you" is not grammatically correct. It should be rephrased to something like "Don't you miss me?" to be correct.
No, it is not grammatically correct. The correct way to say it is "your older sister."
Yes, "she sings badly" is grammatically correct. The adverb "badly" is describing the verb "sings" in this sentence, indicating the quality of her singing.
It certainly can be correct. As with all grammar it depends on how it is used
Technically both are grammatically correct, but it really depends on how you are using them and what context they appear in.
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"Not like that" can be grammatically correct, depending on the context.
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
Neither really. 'In' would be the word to use.
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
"Missing" is not an action verb therefore should not be described by an adverb ( a word ending in ly). Likewise, "I feel badly" follows the same rule and is also grammatically incorrect.
'What a drunkard you are' is a grammatically correct English sentence.
"That was wrong" is a grammatically correct sentence.