A. Words used in the present tense shall include the future; and words used in the singular number shall include the plural number, and the plural the singular.
B. The word "shall" is mandatory and not discretionary.
C. The word "may" is permissive.
D. The word "lot" shall include the words "plot", "piece", "parcel"; the word "building" includes all other structures of every kind regardless of similarity to buildings; and the phrase "used for" shall include the phrase "arranged for", "designed for", "intended for", "maintained for" and "occupied for".