confirm vs affirm
"confirm to support the truth of something, often by saying it again. eg
The receptionist gave her an appointment for 10am on Wed. On Tuesday, she called the receptionist again to confirm the time.
affirm to assert strongly, state as a fact. eg he never thought it necessary to tell her, but finally he decided to affirm to her that he loved her.
'Confirm' is commonly used. 'Affirm' is used much less often.
I hope this has alleviated your pain to some extent."
source from:
http://www.englishforums.com/English/ConfirmAndAffirm/chbqw/post.htm

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when while as
source from:
http://210.240.55.2/~t311/moe/engb6/b6grammar/b6when_while_as.htm

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``such as" is used to introduce examples

``so as" means ``for the purpose of" or ``in such a manner that"

``so that" is usually used to express a meaning similar to ``for the purpose of," ``therefore" or ``with the consequence that"

``such that" is used in the modification of nouns. It is usually used to mean something like ``of a type that"

so as to ... = in order to ...

source from:
http://www2.yukawa.kyoto-u.ac.jp/~ptpwww/eng-note/e-note.html

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Besides, however, nevertheless, otherwise, so, therefore, still, yet, though

besides (preposition) means "in addition to". It precedes a noun/pronoun/gerund
besides (conjunction) means "in addition". It usually precedes its clause, but can follow it
Note that moreover could replace besides here in more formal English.
Also, anyway or in any case could be used here in more informal English

otherwise can either be an adverb of manner or a conjunction.
otherwise as an adverb of manner usually comes after the verb
otherwise as a conjunction means "if not/or else"
"or" could also be used here in more colloquial English

"So" can either be an adverb of degree or a conjunction.

However can be an adverb of degree and conjunction.
As an adverb of degree, however precedes its adjective/adverb and looks like this:
As a conjunction, however usually means "but". It can precede or follow its clause or come after the first word or phrase.
But when two contrasting statements are mentioned, however can mean "but/nevertheless/all the same"

Therefore is a conjunction and it can be used instead of so in formal English. It can come at the beginning of the clause or after the first word or phrase; or before the main verb

As you know, yet and still can be adverbs of time.
However, as conjunctions, yet and still appear at the beginning of clauses and have different meanings:
still means something similar to "nevertheless, admitting that".
While yet means "inspite of that/all the same/nevertheless"

Though/although introduce clauses of concession.
Another use of though (but not although!) is linking two main clauses.
though used in this way means "yet" or "but" and is placed at the beginning but more often at the end of its clause

source from:
http://www.eslmonster.com/article/besides-however-nevertheless

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choose vs. select

According to Merriam-Webster
choose: to have a preference for or to select freely and after consideration
select: to choose (as by fitness or excellence) from a number or group

Select is more formal than choose, and in everyday English, people usually say choose rather than select.
Select means "to carefully choose"; it also means "to use a mouse or keystrokes to mark something on a computer screen."

source from:
http://english.stackexchange.com/questions/13039/difference-between-choose-and-select
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