Which verb form is necessary for creating the present progressive tense?

The present progressive tense is formed using the auxiliary verb "to be" in the present tense combined with the main verb in its -ing form. This construction indicates an ongoing action happening at the moment of speaking or around the current time. For example, in the sentence "She is running," "is" serves as the auxiliary verb, while "running" is the main verb in its present participle form, created by adding -ing to the base form of the verb "run."

To form the present progressive tense correctly, the -ing ending is essential because it signifies the continuous aspect of the action. Therefore, understanding the role of the -ing form clarifies how present progressive conveys time and ongoing action in English.