Some examples are truncated to save space. Truncated examples, showing an incomplete sentence or conversational turn, are used only when the omitted parts are judged to have no bearing on the grammatical point being illustrated, and where overly long examples might distract rather than help the reader.
To me, two adverbial clauses (both 'when' clause and 'where' clause) seem to be modified by only. If so, I don't see why 'where' is used. To me, 'when' alone seems to be right. What I mean: Truncated examples are used / only when the omitted parts are judged to have no bearing on the grammatical point being illustrated, and (when) overly long examples might distract rather than help the reader.
There is no imperative to use "where". It is the author's choice, perhaps just for variety and/or to punctuate the sentence at that point.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
There is no imperative to use "where". It is the author's choice, perhaps just for variety and/or to punctuate the sentence at that point.