On the other hand, there is an indeterminate pronoun, none that can be either singular or plural; It doesn`t matter if you use a singular or a plural plate, unless something else in the sentence determines its number. (Writers usually don`t think of anyone not to mean just any one, and choose a plural verb, as in “No engine works,” but if something else causes us not to consider any as one, we want a singular verb, as in “None of the foods are fresh.”) You`ve found a few tricky phrases, and we have to be careful when choosing the right rules. The example of our website is taken from Rule 14 of the agreement of subjects and verbs and deals with pronouns who, what or what and how the verb should match the noun before these pronouns. The purdue example does not contain the pronouns who, this or what. 10% of people) or is part of a set (for example.B. 10% of the cake). In addition, our rule 1 of number writing says, “Write down all the numbers that begin a sentence.” Regarding the second sentence, Rule 8 of the agreement on subjects and verbs says: “The pronouns of each, each, everyone, everyone, someone, someone and someone are singularly and require singular verbs.” The grammatically correct sentence could be: “Would all passengers take their place please” or the heavy “Would everyone take their place?” Since you have several topics in your sentence, use the plural are. In addition, many writers would remove the comma after “life”. It`s a little late in the day, I know. I don`t know if this has already been mentioned or if it`s because I`m English, but the whole basis of the author`s claim is fundamentally wrong. .