Subject Verb Agreement
every single sentence in English language have a subject and verb, both of them also need to be connected each other.
what's the meaning SVA? basically SVA is about make sure that we always make subject and verb agree each other, in another word you have to make sure that singular subject with singular verb, and plural subject with plural subject too. you'll have to be able to tell the difference between singular subject and plural subject everytimes. singular mean one and plural mean more than one. almost all of them every single plural subject end with S