ABSTRACT
The verb substitute is do (cf. example 101). Since do is a verb, and an irregular one at that, it also has the forms does, did, done and doing. We’ll use do to cover all five forms. Here are some more examples:
(134) Needless to say, some people object to this: they argue that we should never write ‘river water’ or ‘soda water’ as one word, and so by analogy ‘groundwater’ should be ‘ground water’. They doubtless have a point, but if we never allowed change in the English language we would still be writing as Chaucer did.
