What mixed and illogical constructions are?

A mixed construction is a sentence with incompatible elements that begins with one type of structure and shifts to another type of structure.

Probably the most serious error that can be made in writing is mixed sentences structure. Fragments and run-together sentences are minor errors in comparison.


Illogical constuction occurs when one part of the sentence does not agree with the other part in some logical way. The meaning of the sentences is no clear.