Countable nouns can be singular, use them with a / an.
Singular countable nouns take singular verbs, Plural countable nouns take plural verbs.
Uncountable nouns take a singular verb.
Uncountable nous are ONLY singular, don't use them with a / an.
Research shows what employers look for.
An impresive resumee is umportant. Candidates face stiff competition.
Give an example of how do you achieved a goal
Explain how your work can save money.