Final answer:
The correct answer to the sentence completion is b) Present progressive, which is used for actions or states of being that are currently happening.
Step-by-step explanation:
The sentence to be completed is indicating a verb form that describes an action or state of being occurring right now. The correct answer is b) Present progressive. The present progressive tense is used to describe actions that are currently ongoing or continuous states of being. For example, in the sentence 'I am reading,' 'am reading' is the present progressive form of the verb 'read', indicating the action is happening at the moment of speaking.
Verb tenses are important in English to convey when an action happens, whether it is in the past, present, or future. Consistent use of the correct verb tense is crucial for clear communication and to avoid confusion. When the main verb of a sentence is a form of 'be' (am, is, are, was, were), it will often indicate a state of being in various tenses.