No, that is incorrect in the above context. " But not "when".
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Mr. Tomcan when be used as a noun meaning a period of certain action?Yes. People do substitute "When?" for "What day?" and similar constructions. It sounds a little off to my ear, but it's quite common to do it.
Mr. Tomyou don't have much objection to the underlined expression? And people do use it? When are you talking about?I have no objection to it. Yes, people do use it. Personally, I'd say "What day are you talking about?", but that's my preference.
Mr. TomHiIf a person is talking about a certain action which the other cannot remember exactly – can he ask this question? In other words, can when be used as a noun meaning a period of certain action?A – And that day when we lost our key and it was raining…B – When are you talking about?A – When Aunt Mary came to stay. Remember?Thanks,TomThat sounds fine to