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c. perfect progressive
The perfect progressive tenses are formed by adding am , is ,are ,was ,were to the present participle ( the form of a verb that ends in - ing ) .
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The correct fill-in for the blank to describe the "ing" forms of words is given in option (C). Therefore, perfect progressive is the correct answer.
What is perfect progressive?
The progressive element is used to describe acts that take place as processes through time rather than in a single instant. The present participle or "-ing" forms of basic verbs are always used in the progressive aspect.
The perfect progressive tense, also known as the perfect continuous tense, is used to indicate that an action or event is, was, or will continue to occur (progressively), but that it will end or pertain to a later time (perfect).
First of all, keep in mind that action verbs are the only verbs that can be used with the progressive. The fact that we utilize the simple perfect forms to indicate completed quantities and the progressive perfect forms to emphasize the continuous duration of a single action mentioned is another significant distinction.
Check out the link below to learn more about perfect progressive;
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