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).
Apostrophe. 1  The marking of the omission of one or more letters (as in the contraction of do not to don't). 2  The marking of possessive case (as in the eagle's feathers, or in one month's time). 3  The marking of plurals of individual characters (e.g. p's and q's, three a's, four i's, and two u's, Oakland A's).