• On the table there were many dish.
• The lab assistant finished every tests.

In the first example, many indicate that the plural “dishes” is needed. In the second example, every indicates that the singular “test” is needed.
In written expression questions on the TOEFL test, you should watch very carefully for keywords, such as “each, every, a, one, and single”, that indicate that a noun should be singular. You should also watch carefully for such keywords as “many, several, both, various, and two” (or any other number except one) that indicate that a noun should be plural.

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