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I'm accustomed to saying `together with` using the `~ to issho ni` fragment,
but I've been noticing that some people I talk to phrase this using `~ totomo
ni` instead.

i.e.

> 彼女と一緒に日本へ来た。  
>  Kanojo to issho ni Nihon e kita.

and

> 彼女とともに日本へきた。  
>  Kanojo totomo ni Nihon e kita.

seem to be fundamentally equivalent.

Are there any nuances that the two have that dictates when and where they
should be used? Probably very slight meaning deviations? Or are they
essentially perfect equivalents of each other when it comes to saying
`together with` (and yeah, I'm aware that `~ totomo ni` has other meanings
aside from that)?
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2011-06-01T07:42:28.153
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question
grammar usage
What are the fundamental differences between the ～と一緒に and the ～とともに fragments?
It could be the case that とともに is more formal version of 一緒
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2011-06-01T08:36:18.420
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一緒に, as you say, is regularly used for saying doing something "together".
共に(ともに) is more explicit about who you are performing this action with,
thereby placing a stronger emphasis on the bond/camaraderie.

私と一緒に戦います!

Fight together with me!

私と共に戦います!

Fight hand-in-hand/side-by-side with me!

So I would say you'd pick which to use depending on whether you are trying to
place an emphasis on the action or the other person(s) involved.
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2011-06-01T12:47:59.377
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According to page 91 of the 類義語使い分け辞典 [1], [quoted
here](http://nihon5ch.net/contents/bbs-study/old/mie-bbs.cgi?s=165), 一緒に
requires that the action take place in the same time and location. 共に does not
have this restriction, so the subjects may perform the action (let's say
日本へ行く) at the same time but via a different route, or via the same route but
at slightly different times. 「彼女と一緒に日本へ来た」 means that you and she came to
Japan at the same time _and_ were together the entire way, but 「彼女とともに日本へきた」
_could_ mean that you came to Japan at the same time, but took different
flights to get there.

To provide another example (extracted from Google), consider
「一緒に学ぼう！共にがんばろう！」. The first sentence shows that the action, 学ぶ, is being done
at the same time and in the same location. The second sentence uses 共に instead
of 一緒に, and so the best interpretation is probably that the action, がんばる, is
being done by everyone at the same time, but in their respective locations.

Sources:

  1. [類義語使い分け辞典](http://books.google.com/books?id=J5MxAQAAIAAJ) (Google Books)
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2011-06-01T13:21:38.127
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No, they are not equal in meaning. "一緒に", as already stated by some people, is
used more in casual situations. I can't imagine people saying "共に" in usual
conversations but I can easily imagine a politician saying "共に". However, I
wouldn't call "一緒に" an informal word or "共に a formal word. I would say "共に"
sounds more **_solemn_** than formal.

Now, the question is where is the boundary to decide when to use which one,
"一緒に" or "共に"?

  * a.)一緒にがんばろう [To your friend(s) or family member(s)] 
  * b.)一緒にがんばりましょう [To your colleague(s) or people in business relationship. You can say this to someone you've just met if needed.]
  * c.)共にがんばろう [To your subordinates/students. Even though "がんばろう" is not a formal form, it would still sound weird in casual conversations among friends/family members]
  * d.)共にがんばりましょう [nearly the same as b.) probably because the situations where "共に" is allowed are overlapped by the ones where "がんばりましょう" is allowed.]

"共に" sounds more solemn than "一緒に", by which I mean, "共に" places more
importance on the task that will be done _together_. "共に" makes you feel like
you are part of "something big" giving the speaker more power. This explains
why it can't be used in casual conversations. "共に" gives the hearer more
impression and emphasizes the importance of the task.

You should use "一緒に" in usual conversations if you are not making a public
speech or talking to a business partner. Literature prefers ”共に" because of
its solemnity. Your example, 彼女とともに日本へきた。sounds like a sentence right out of a
novel or a character's monologue.

Also, "共に" tends to be used in advertising or invitation, in order to show how
serious we are about what we are going to do _together_.
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