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Neko [114]
3 years ago
8

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

English
1 answer:
dimulka [17.4K]3 years ago
6 0
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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