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What's d diff between Past tense (migrated) and Present Perfect (have migrated?)
I'm confused coz OG states that:
past tense- for action completed in the past
present perfect tense- describes an action that ocurred in an indefinite time in the past
Both are actions in the past, so how do you know when to use wch? Is the action in present perfect completed(as in past tense) or it just states a start of action?
Present Perfect Tense â€¢ Actions or states that started in past and continue into present
(We have lived in a hut for three days We have been walking all over the countryside since last weekend)
â€¢ Action or states that happened a number of times in past and may happen in future (Italy has had many changes in govt since WW2) â€¢ Something that happened at an unspecified time in past (A has written a critical essay about B) Past â€¢ An event or state that took place at a specified time in past, and is now over & done with (A wrote a critical essay about B in 1970)
so is the "Something that happened at an unspecified time in past" of present perfect tense an action that is completed?If there's no specified time, like in the following passage :
"It is possible that Native Americans originally (have migrated/migrated) to the Western Hemishpere over a bridge of land that once existed. "
This sentence does not specify the date...so should it be have migrated or migrated?