The first sentence is not right. You can say “we don’t have a second chance,” but not “we have not second chance.” The second sentence is correct. We can use the word “no” before a noun to make the sentence negative. “Not” does not serve this same adjectival function. “There is some possibility of success” -> “There is no possibility of success” “They have a reason to be upset” -> “They have no reason to be upset” “We have a second chance” -> “We have no second chance”

In #1, "not" will be heard as an adverb. This means that it does not modify the noun "chance". There are two possibilities: either it modifies "have" or "second". Most people will hear it as modifying "have" unless you vocalize it in such a way as to emphasize that it modifies "second". If it modifies "have", then it means the same as "we do not have second chance". Is that sentence correct? Well, yes and no. It is a correct sentence but it doesn't mean what you probably want it to mean. You probably meant to say "we do not have a second chance". So what is the meaning of "we do not have second chance"? I will not explain here, but look up the meaning of the common expression (especially among children): "I have first dibs". Once you understand that, you can begin to understand the meaning of having second chance.

Both of the sentences you provided are grammatically correct, but they have slightly different structures: "We have not second chance." "We have no second chance." In everyday English, the second sentence is more commonly used and sounds more natural. Here's an explanation for each sentence: "We have not second chance." - This sentence is grammatically correct, but it is less commonly used in modern English. The word "not" is placed before "second," indicating the absence of a second chance. However, it is more idiomatic to use "no" instead of "not" in this context. "We have no second chance." - This sentence is the more standard and commonly used form. "No" is used to indicate the absence or nonexistence of a second chance. It is a more natural and clear way to express the idea that there is no opportunity for a second chance. In summary, both sentences are grammatically correct, but the second one is preferred for everyday communication.

"We have not a second" is correct but not common. It's only used in British English. Like " I have not a car."

The first one isn't correct. The second one is the only one that's a complete sentence.