English used to have a distinct form, called the passival, which was displaced over the early 19th century by the passive progressive, and is no longer used in English. In the passival, one would say "the house is building", which is today instead "the house is being built"; likewise "the meal is eating", which is now "the meal is being eaten". Note that the similar "Fred is shaving" and "the clothes are soaking" remain grammatical. It is suggested that the progressive passive was popularized by the Romantic poets, and is connected with Bristol usage