[QUOTE=navi tasan;1012808]1-I will try to open that door once more with the blue key.
Does this necessarily imply that I have already tried to use the blue key to open the door? Is 'with the blue key' restrictive?
I think that the answer to both questions is: probably yes, but not necessarily. Language is not logic, as I've said before.
2-I will try to open that door once more, with the blue key.
Does this imply that this will be the first time I will be using the blue key to try to open the door?
Or does it imply that I have used other keys to open the door and I might have used the blue key before, but this time I am going to try to open the door again and I am going to use the blue key?
Both interpretations are possible.
In other words, is 'with the blue key' non-restrictive?
You should always bear in mind that many if not most writers are careless about commas, and it is best to keep an open mind about what a user of commas may be trying to say. Context will be your best guide.
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