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good day to all...

these , those
i know one is for distance and the other is for near and both are plural....

what is the difference between them in the following sentences ?

Why haven't those scientists at UK find a cure for flue?
Why haven't these scientists at UK find a cure for flue?

what are those myths ?
what are these myths ?

why you do not depend on those ideas to make a report ?
why you do not depend on these ideas to make a report ?

what does decide which word to be used ? tense or meaning ?
the use of any word effects the meaning of the sentence ? and changes the meaning?

thanks a lot
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avesta leoi know one is for distance and the other is for near and both are plural....what is the difference between them in the following sentences ?
It is the same meaning.
avesta leowhat decides which word to be used ?
It is how you envision the items. Generally, we envision things we like or agree with as near, and things we dislike or disagree with as far.
avesta leothe use of any word affects the meaning of the sentence ?
Not the meaning, but the writer's feeling (as indicated above).
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thanks a lot Mister Micawber
so there is no difference in the sentences ?

all are right ?
There is no difference in basic meaning, no. Your sentences have other problems:

Why haven't those scientists at UK found a cure for flu?
Why haven't these scientists at UK found a cure for flu?

What are those myths ?
What are these myths ?

Why don't you depend on those ideas to make the report ?
Why don't you depend on these ideas to make the report ?