Posted by rfvv on Monday, November 16, 2009 at 7:10am.
1 and 2 mean about the same thing, yes. 1 is the more common usage.
3 could be rephrased: Volunteer work involves a lot of time.
http://www.eslcafe.com/pv/pv-a.html
Good list of "phrasal verbs" -- look them up alphabetically.
http://www.eslcafe.com/idioms/
Good lists of idioms -- look at the whole collection or look them up alphabetically.
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