Performance Gap. Background. In recent years, the housebuilding industry and government have grown increasingly concerned over the potential gap between design and as-built energy performance.
The apostrophe (â or ') is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet or certain other alphabets.In English, it serves three purposes: 1  The marking of the omission of one or more letters (as in the contraction of do not to don't).he apostrophe (â or ') is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet or certain other alphabets. In English, it serves three purposes: 1  The marking of the omission of one or more letters (as in the contraction of do not to don't).
Definition of apostrophe for Students. : a mark ' used to show that letters or figures are missing (as in âcan'tâ for âcannotâ or â'76â for â1776â) or to show the possessive case (as in âMike'sâ) or the plural of letters or figures (as in âcross your t'sâ)