In this sentence verb shows that the action is going on and not completed at the time of speaking.
1) In affirmative sentences the auxiliary verb is /am/are is used with the present participle.
2) In negative sentences auxiliary verb is used with ‘not’ and present participle.
3) In interrogative sentences auxiliary verb is used before the subject.
We will take one example with first, second and third person and transform it into affirmative, negative and interrogative sentences in Present Continuous Tense in tabular form.
Have a look-
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Go over-