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All meaning everything, takes a singular verb, all meaning everybody, takes a plural verb: All of us are present.
When we precede number by the it denotes a unit and is singular. When it's preceded by a it means several or many and is plural.
When the subject is singular, the verb must be singular and when the subject is plural, the verb must also be plural. Take care when a plural noun comes between a singular subject and its verb, as in the example above.