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This is not a mandatory rule. It's something which is
often done (thus, to me, optional), per Swan. |
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Which part is not mandatory? I may have misunderstood, but I'm assuming the rule you are referring to is:
will cannot be used in a
when clause where
when
is an adverbial conjunction. I don't believe there's anything
that's not mandatory about it. Do you have an example?
(My comments below are to the effect that the examples are not cases where the rule applies.)
[The] day will come when I will get used to sleeping there when is a relative pronoun with antecedent
day, not an adverbial conjunction.
no idea when I will get paid when in an indirect question, not an adverbial conjunction.
When will I get paid?
I don't know when I will be able to see her when in an indirect question, not an adverbial conjunction.
When will I be able to see her?
These are not
When I (*will) get used to sleeping there, the day will come.
When I (*will) get paid, I have no idea.
When I [am / (*will be)] able to see her, I don't know.
in the intended readings, i.e., the last two are not to be read as fronted object constructions.
CJ