As we draft, we often write sentences in which the grammatical subject is empty, with the real subject hidden later in the sentence. For example, look at this sentence:
It is difficult to control costs.
The grammatical subject is it, but that word is empty of any meaning. The real subject is costs, or perhaps control, both hidden later in the sentence. The sentence can be improved by making the hidden, real subject also the grammatical subject. So consider revising the sentence to
Costs are difficult to control.
or
Controlling costs is difficult.
This week, as you revise your drafts, look for empty subjects you can replace with real subjects.
