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I have two sentences that I was unsure if I needed to use "do not" or "does not". Now I know that the correct one is the one with "does not" but I don't understand the reason why. The two sentences are as follows:
Nevertheless, having those skills does not automatically guarantee their performance as marketers.
Nevertheless, having those skills do not automatically guarantee their performance as marketers.
The rules is that you use "do not" with words that are plural and "does not" with words that are singular. In my mind, "those skills" is "they". And they do not.
I don't understand why "those skills" is "It". It does not.
Someone told me that the reason that "does not" is the correct option is because of the word "having". But I don't understand the reason or if there is a rule. Is this correct? If so, why? And if not, can anyone please explain? Thank you.