I hope that I haven't erred by "correcting a correct question tag." But perhaps I'm missing something that you see.
As I understand it, the original post by "trainee" was asking for corrections to the following tag:
"Is John ill? He's lost a lot of weight."My previous post provides the following corrections:
"Yes, he's rather slender these days, isn't he?"
"Is John ill? He's lost a lot of weight."As I see it, the comma in the original tag is grammatically incorrect since it allows the statement ("Yes, he's rather slender these days.") to be combined with a question ("Isn't he?") within one sentence.
"Yes, he's rather slender these days. Isn't he?"
Replacing the comma with a period, and then capitalizing the first word of the next sentence. i.e., "Isn't", provides the necessary correction here.