4. They all mean the same thing, as you note. However: Nothing but implies that the subject (*it) was more overblown than with the lone but, hence the nothing. There is no great difference …
"Nothing particular" is a perfectly well-formed NP, parallel to "nothing unusual". It just happens not to be a familiar expression, and its meaning is derivable from its components. "Nothing in …
There is nothing to tell. (Lucy on the phone with a friend) In the first example using "to tell" instead of "to say" would change the meaning; "to tell" implies a story (narrate, relate), announcement …
There is nothing wrong with "someone else's". Inexplicably, many spelling checkers don't automatically recognize possessives of user-added words, so don't try to read much out of …
At one point in our conversation he starts to "spam" (not literally, the messages have meaning and are well-formulated) me with many messages, but I really have nothing to say …
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