When Should I use "NOT " and When should I use "NO"?
361087
Not and no are both negators; that is, words used to express or imply a negative.  No is used as a negative response to a question or request (in this sense it is the opposite of yes).  For example, "do you like oatmeal?" (question).  No.  Or "can I stay home from school today?" (request).  No.  No is also used to indicate the absence of something.  "There is no hot water."  Not implies withholding of permission, ("you can not go to the movies"); a request to abstain from doing something, ("do not make noise"); or a negative idea ("you will not fail").  Although both no and not can be used to express a negative directive, no has the effect of being more direct and forceful, with no wiggle room.  Compare "no smoking" with "do not smoke here."  No, you can not copy this answer and use it in your homework.
277074
Spanish: "No sé.  No me preguntes."
467414
NO!\nNO!\nNO!\nNO!\nNO!\nNO!\nNO!\nNO!\nNO!\nNO!
1093518
I am not sure why you think "never buy unnecessary things" is not proper usage.   Never (just like "not") is an adverb used to express negation, i.e., to make a sentence negative.\n\nSo looking at your sentences:  the positive of your statement would be "I buy unnecessary things" which is a logical sentence, right?  So to negate that statement we would use never or not: "I never/do not buy unnecessary things."  Both these sentences would mean the same thing and both would be considered "proper usage."\n\nNow to have a double negative, you would need to combine the negative verb (in your example, "never buy”) with a negated direct object (in your example, “things” is the direct object).  So we could make your sentence into a double negative: "I never buy NOTHING" or "I never buy NO THINGS."  BUT, your use of the adjective "unnecessary" does NOT negate your direct object "things"; you DON'T have a double negative.\n\nBut even if we assumed that "unnecessary things" was negative and that you did have a double negative (again, you DO NOT), BOTH your example statements would then be double negatives...not just the first example.\n\nSo finally, my point: other than the severity of the negations ("never" being more sever than "not"), your sentences mean the same thing and are both grammatically acceptable.
477027
aint is not supposed to be used. It is a double negative
429977
not more than \n\nor\n\nnot less than
79349
Um I'm not sure what you mean. If you mean why "not" shouldn't be deleted from all languges read the above sentence.
956823
Either *could* be grammatically correct, but they have different meanings.  In the first example, you are suggesting that travel is possible, but not definite.  "I don't definitely travel tomorrow; I might wait until the next day" is a grammatical sentence.  In the second example, you are clearly saying that you will not travel--it is definite.\n\nBut the first version is awkward, even if that is the meaning you intend.  It would be far better to say, "I may not travel," if that's what you mean.\n\nGood luck!!
798050
You should say...\n\nYo no lo tenía permitido pero de todas formas vi el show.\nor\n\nYo no lo tenía permitido pero de todos modos vi el show.\nor\n\nYo no lo tenía permitido pero de todas maneras vi el show\n\nyou can invert to the order in all 3 sentences, for example...\n\nyo no lo tenía permitido pero vi el show de todas formas.
382750
If you can't get a person's name right, don't use it.\nDon't be deceptive.\nNo means No.
1056041
Answers:\n\n1.  I do not fear you.\n2.  I do not fear you.
405129
Here are the errors:\n\nNeither refers to two things: neither "x" nor "y", you have used it for three.\n\n"that" is unnecessary.\n\nIt would be best written as:\n\nThe lessons, the paper, the subject; none remind me of you.
351713
In American English it is CANNOT, but I think that in British English you can use "can not."
121372
NO,NO,NO\nI don't thing so
823716
When you use either/or, or neither/nor, the verb must agree with the subject that is closest to it. B and C as you have typed them here are both correct. Hopefully you will apply that knowledge to your other homework items and do them yourself.
963999
Everyone has given you nouns - which is what you don't want.\n'Mention' is a verb.\n'Caution', 'question', 'motion', 'ration' can be nouns or verbs.
686456
Is none of the above an acceptable answer?