7-Subject-Verb+Agreement

Subject/Verb Agreement
 * Definition: If the main noun of the sentence is singular, then the predicate is also singular.
 * If the subject of the sentence is plural then the predicate would be plural
 * If the subjects are joined by AND then it is automatically plural
 * If the subjects are joined by or or nor, the verb should agree with the closer subject
 * Your verb will 90% of the time agree with the first noun to the left

The tiny __chips__ that operate the computer is the source of many computer problems.

Underline= Subject Red = Predicate

The tiny __chips__ that operate the computer are the source of many computer problems

This sentence is written correctly because now the predicate and the subject agree in number.