Eventually, this rule formulated the defining of an ellipsis and elliptical sentence in which grammarians began creating types of elliptical constructions. William Bright describes that men such as Sag and William's, during the 1970's began to research elliptical construction and words that were applied rather than stated in Middle and Modern English. From there they began prescribing certain types and usage's for an ellipsis. For example:
1. The omission of words to escape repetition.
-Jane went one way, Stephanie the other.
2. The omission of words which are apparent because of the situation at hand or because of accompanying words.
Classification of Ellipsis
Now let's find out what exactly can be omitted in incomplete (elliptical) sentences.
It is necessary to mention that ordinary English grammar normally requires the omission of certain elements:
ex. He heard the whirr and click of machinery;
-infinitive marker to not repeated before a second infinitive