When using the perfect tenses of verbs, it's necessary to add a/an infinitive

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asked Sep 28, 2017 17.5k views

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Anekix · Answer 1 · 2017-10-04T09:30:48+0000

When using the perfect tenses of verbs, it's necessary to add a helping verb.
For example: I have been working on that paper for weeks.
Have and been are helping verbs, and the whole tense is called present perfect progressive.

When using the perfect tenses of verbs, it's necessary to add a/an infinitive

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