for those who are
Extremely beneficial to those.
Neither of those spellings is correct; the correct spelling is "extravagant."
"Are those they" is correct. "Are" is a form of the copulative verb "to be" and is not transitive. In this sentence it is linking two subjects; "them" is the accusative form of the pronoun "they," but since this sentence has no objects, it would be incorrect. Unless to object is known commodity understood by those involved in the discussion.
Neither of those are correct. Correct variations would be: "did not receive" "has not received" "had not received" Which you use will depend on the overall sentence you are trying to create.
Not only did you spell it the same way twice, you spelled it the same way twice.
The correct grammar is: "Are those correct?"
It depends on the context and meaning of the sentence. "For those who are" is correct in some contexts; "to those who are" is correct in other contexts.
Extremely beneficial to those.
No, it is not correct to say "those ones." "Those" is already a plural determiner, so there is no need to add "ones" after it. Just saying "those" is sufficient: "I like those books."
Neither of those spellings is correct; the correct spelling is "extravagant."
No, it is not correct. The correct way to phrase it would be "Thank you to all of you."
yes
The correct way to say it is "These children" for referring to children who are nearby, and "Those children" for referring to children who are farther away.
Religion relativism
The sentence, 'Pity those who are unhappy.' is a correct sentence. The subject of the sentence is implied, the subject is 'you', the verb is 'pity'.
No. It would be better to just say those or these.
Australia in East Hemisphere. Those who think this is not the correct answer may correct me.