But to the rule that the protasis takes shall there are three exceptions, real or apparent; W. is found under the following circumstances:
(1.) An original pure-system or coloured-future W. is not changed to Sh. by being used in subordination to if (or unless). It is retained with its full original force instead of some verb like wish or choose. In If we would believe we might move mountains, the meaning is If we chose to believe, different from that of If we believed or should believe. So
It would be much better if you would not be so hypocritical, Captain Wybrow.—Eliot.
If you consented not to be, or did not insist on being.
It would be valuable if he would somewhat expand his ideas regarding local defence by Volunteers.—Times.
If he consented to.
(2.) When the if-clause (though a genuine condition) is incorrectly expressed for the sake of brevity and compresses two verbs into one, the W. proper to the retained verb is sometimes necessarily used instead of the Sh. proper to the verb that, though it contains in strict logic the essential protasis, has been crushed out. Thus: If it will be useless I shall prefer not to do it. It is not the uselessness that is the condition of the preference; for the use or uselessness is subsequent to the decision; it is my conviction of the uselessness; so that the full form would be If I shall be (or am in ordinary speech) convinced that it will be useless, I shall prefer, &c. The following example can be defended on this ground, if never again will he standing for if he shall realize that he will never; the feebleness that decides his not wishing is subsequent to it, and can only condition it if taken in the sense of his anticipation of feebleness.
And if there is to be no recoveiy, if never again will he be young and strong and passionate, if the actual present shall be to him always like a thing read in a book or remembered out of the far-away past; he will not greatly wish for the continuance of a twilight that...—Stevenson.
