The right form of the verb that should be used in this sentence is this one:
1) The whole world has undergone a significant change for the last three years.
What is the right form of the verb to use?
The right form of the verb to use is the past participle. In this sentence, it is quite evident that the event being described is one that was ongoing sometime in the past and this is where the past participle often finds application.
The past participle is used for something that was going on at some point in the past. The action in this case is the change that the whole world underwent in the past three years.
When trying to express the action, we will use the past participle of the word which is the word, undergone. We will also use the verb, has before the past participle of the word, undergo.
Learn more about past participles here:
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