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

User Halsdunes
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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.
User Anekix
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