One example (noun clause): He doesn't know when the plane will arrive. Incorrect: When the plan will arrive, we will be there waiting at the gate.
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LaboriousHello, I have come to know that using a future-tense verb form after words such as "after", "before", "when", "until", and so on is incorrect grammatically. I'd like to ask you people if it's always incorrect to so or if there are certain situations where this rule applies, please. Thank you.You can add "if" to your list.