Jigneshbharati Is "had" in "has had" the main verb? What does "had" mean in that that-clause""? The verb is "have".
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JigneshbharatiIs "had" in "has had" the main verb? What does "had" mean in that that-clause""?
The verb is "have".
The tense is present perfect.
Do you understand the verb "have" in this sentence?
Some research has a global impact and some does not.
If you do, you can understand the different tenses, because only the tim