abhash4gmat
Are all idioms are Additive Phrase?
in short, we can say that all keywords for additive phrases are idioms.
your question may imply that you are not 100% certain about the meaning of "idioms" and "additive phrases".
Idioms: any group of words that always come together, not following a common grammatical rule or literal translation
examples:
.. literal translation such as : "a piece of cake" ---> means "easy" - "at one's peril" ---> means "at his own risk"
.. grammatical rules as : "as well as" , "more ... than", "rather than", "difference between .. and ", "both .. and"
(so you can't write "both .. as well as" -- "more .. as")
additional phrases: phrase: is an incomplete clause (don't have a subject and verb"
additional: adds a meaning which is usually not crucial. without it, the meaning is still ok, but with it, the meaning is better.
additional phrase : modifies a noun. The whole phrase acts as an adjective for the noun it modifies. preceded by a comma
example: [url]https://gmatclub.com/forum/in-addition-to-having-a-greater-number-of-students-than-81820.html#p613351
[/url]
keywords: in addition to, accompanied by, along with, as well as , including, together with, ...
(they are idioms, so can't be changed - we can't write "accompanied with")