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Lots of native speakers of English say 'more stupid' and 'most stupid'. Is it right or wrong grammatically ?
I dont think there are degrees of being stupid - so I will not use such terminology.
Grammatically it is incorrect
As for the quoted sentence: there's some things.....
in English grammar the verb must agree with the subject in number
therefore: There ARE some things THAT you shouldn't forget to to do.
Also I am not a fan of contractions. The sentence will have more meaning (in context) if read as:
There are some things that you should not forget to do.
I disagree. the sentence would be more accurately phrased as "There ARE some things you shouldn't forget to do".
As far as "Informal Language" is concerned the sentence is correct.
Saying that a grammatical mistake is "informal English" is a way of escaping from the truth. A mistake is a mistake !!!!
The Sentence is Incorrect,
It should be "There are some things that you shouldn't forget to do."
It is true that man forgets of his nature