Строй современного английского языка

D IFFERENT TERMS
Besides the various theories put forward with reference to the opposition writes — is writing, we must mention various terms that have been proposed to denote its members. H. Sweet used the term "definite tenses" for what we call the continuous aspect. ¹ This term cannot be said to be a happy one, as the word "tense" disguises the fact that we find here a peculiar grammatical category different from that of tense.
Another term which has been used is, "expanded form", or "progressive form". The term "form" cannot be described as satisfactory since it leaves the basic grammatical question open: we might as well speak of the past form, or of the passive form, etc. As to the adjectives modifying the word form, it must be said that expanded merely gives a characteristic of the analytical structure of the form, without indicating its meaning. As to progressive, it does indicate the meaning, but is hardly preferable to the adjective continuous. So we will stick to the term "continuous aspect".