PRN
unecessary
I don't believe that there is an abbreviation for Chicago.
RES is the abbreviation for resource. A resource is a source of supply, support, or aid, especially one that can be readily drawn upon when needed.
The correct spelling is necessary (needed, required).
Warranted means needed or necessary.
unecessary
Boston is a city, and does not really have an abbreviation. However, for it could possibly be written as "Bos" if an abbreviation is needed.
In medicine, the abbreviation PRN is used. It is from Latin "pro re nata" meaning for an occasion that has arisen, as circumstances require, as needed.
It is ft. Lineal is not necessary.
The Spanish word for March is "Marzo". Most places do not abbreviate it because it is such a short word, but when abbreviation is necessary, the term "Mar." can be used. It is usually not used though because the word "mar" is Spanish for sea, and therefore most people just write out Marzo whenever they use it.
whenever the president determines that its necessary
whenever
No
There is no standard abbreviation in English for "cousins," because the word is so short that no abbreviation is usually needed.
Reverend is commonly abbreviated as Revd and Rev. (the period/full stop is necessary in the latter abbreviation)
yes but when you write it you don't but when you type it you do
I don't believe that there is an abbreviation for Chicago.