Have is used for present and Have been is used for past continous.
How do you think the process of switching between users would have been different if you didnt assign the new user a password?
elevation between the areas is different
Well they both mean the same thing just different wording.
population movement and migration is just a same thing,is just is has been used in different terms.
Forty-three different people have held the office of US President. There have been 44 different administrations, but Grover Cleveland had two of them, the 22nd and 24th with Benjamin Harrison's between them.
There is structural difference between xylem and phloem. This is because their function is also different. Had there been no difference in structure, how these could have performed different function?
Scientists have been and are still working hard to check on different dimensions and if travelling is actually possible between dimensions.
There is not a difference between the 80th percentile and been in the top 80. This is the same thing just written in different ways.
there have been people on both places
Early 454 might have been different than the later 454.
The male is more yellowish then the female so I have been told! The female is a lighter yellow!
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