"could" asumes it may have, "would" asumes it was.
had gone and has been gone are in past . had gone is sometime before he or she had gone but has been gone is long time before . had gone is compared to gone and has been gone is the superlative of all....
it has been decided is a passive sentence. and it has decided is an active sentence. it has been decided means that "it" was decided by someone/something else, whether it has decide means that it decided by it self.
true value is something that is true and experimental value is some thing that has been experimental with
A postulate is something that is accepted as true without proof. A theorem, on the other hand, is something that has been proven and is now being accepted as true.
A Hypothesis is something that you set out to test to prove or disprove. A Lemma is something that has already been proved that you use to help prove something else.
Much the same as the difference between to and in.
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?
There is no difference. It would have been more difficult to get involved in Vietnam WITHOUT the domino theory.
one has been on the end
had been is before and was is just there
Here's an amateur's take on it. "Were" would be used when talking about the near past. "Had been" would be used to draw attention to a longer time-span between your studying and the present.
A conclusion explains what you found out by your research. An evaluation explains what went well and what could have been improved and how.
They mean the same A handsome cab was horse drawn. A taxi could have been water transportation.
499. Had there been a year 0 it would have been 500.499. Had there been a year 0 it would have been 500.499. Had there been a year 0 it would have been 500.499. Had there been a year 0 it would have been 500.
Have you ever been to or have you been to are just ways of saying the same thing. A person would say this asking if someone has been to a specific place in question.
The difference between Aptitude and Skills is that Aptitude could be the potential, which has as yet not been tapped and trained to a skill level. Whereas skills, as the word describes is, it is present here and now in the individual.
A hypothesis is what someone suggests could be true, and then tests it to see whether or not it is true. A law is what has been proven to be true.