Today, I encountered with this sentence "All people know is what you tell them" and I totally got confused why the author uses the verb IS in the sentence. I think "All people know" is plural that's why I'm confused. Could someone help me out ?
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all = the only thing
The only thing people know is what you tell them.
Here is another example: All I can do is call John and ask for help.
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The subject of the sentence is a Noun Phrase, and it is singular.
https://en.wikipedia.org/wiki/Noun_phrase
A noun clause can be the subject of a sentence.
It can be singular or plural: All the books I've read are purple.
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Basically, you can replace "All people know" with "People's knowledge", in which case, knowledge is a singular.
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Well, "all people know" constitutes a whole : "the people's knowledge", therefore, you use the singular. – MorganFR Apr 8 '16 at 13:44
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MorganFR when can we use this grammatical point. I mean how can we understand that a subject contains a whole. can you exemplify other examples ? – eHH Apr 8 '16 at 13:49
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1Because you can replace one idea with another does not make a grammatical rule. – Matt E. Эллен♦ Apr 10 '16 at 17:07
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Collective nouns (people, company,and the like) can use either a singular or a plural verb, depending on the meaning of the sentence.If the noun is used to refer to the group as a whole, a singular verb is used; if it refers to the individuals within the group, it takes a plural verb. In the example you gave, it is the group 'people' that is meant, not the individuals that comprise'people.' https://webapps.towson.edu/ows/moduleSVAGR.htm
