and would as will; in what follows, Sh. may be taken as an abbreviation for shall, should, and should have, and W. for will, would, and would have.
In our usage of the Sh. and W. forms, as seen in principal sentences, there are elements belonging to three systems. The first of these, in which each form retains its full original meaning, and the two are not used to give different persons of the same tense, we shall call the pure system: the other two, both hybrids, will be called, one the coloured-future, the other the plain-future system. In Old English there was no separate future; present and future were one. Shall and will were the presents of two verbs, to which belong also the pasts should and would, the conditionals should and would, and the past conditionals should have and would have. Shall had the meaning of command or obligation, and will of wish. But as commands and wishes are concerned mainly with the future, it was natural that a future tense auxiliary should be developed out of these two verbs. The coloured future results from the application to future time of those forms that were practically useful in the pure system; they consequently retain in the coloured future, with some modifications, the ideas of command and wish proper to the original verbs. The plain future results from the taking of those forms that were practically out of work in the pure system to make what had not before existed, a simple future tense; these have accordingly not retained the ideas of command and wish Which were the practically useful and which the superfluous forms in the pure system must now be explained.
Thou shalt not steal is the type of shall in the pure system. We do not ordinarily issue commands to ourselves; consequently I shall is hardly required; but we often ask for orders, and therefore shall I? is required. The form of the shall present in the pure system is accordingly:
Shall I? You shall. He shall. Shall we? They shall.
As to the past tense, orders cannot be given, but may be asked
