All boys (plural) are my friends . This is not a natural sentence; it is unlikely that anybody could claim that all boys were their friends. Someone could, more reasonably, claim, " All the boys (in a particular group known to both speakers) are my friends ".
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IvanhrThe suffix "s" is added to form plural nouns.Thus,All (the) boys are my friends. (friends agree in number with "all boys"-->plural)Every boy is my friend. ("friend" agrees in number with "every boy"->singular)With uncountable nouns, it's possible to use "all" with singular nouns (because they usually have no plural form).I will take all the sugar you have. ("s