Lamiahill30 Lamiahill30

12-08-2016
English

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

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WorldlyGlass49 WorldlyGlass49

24-08-2016

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.

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