Jobs.
The job belongs to last year as it was, so it is a possessive. So there is an apostrophe needed between year and s, so it does not indicate a plural. The correct form is: Last year's job.
The correct sentence is "He never has a job" because "has" is the correct singular verb form to match the singular subject "he." "Have" is the plural form of the verb and would not be correct in this context.
The plural form for the noun job is jobs. The plural possessive form is jobs'.
"Gases" is the strongly preferred spelling. The plural of "gas".---Some style sheets reserve the use of the spelling "gasses" as a present singular tense of the verb "to gas" (to treat with gases). This follows the double consonant rule as in gassed and gassing.Example : "The exterminator uses toxic gases."Example : "In his job, the exterminator usually gasses the hiding vermin."
The correct spelling is "assigned" (given as a task or job).
There is no plural form since it is considered an uncountable noun.
That is the correct spelling of firefighter (from fireman).
That is the correct spelling of "job share" (also job-share) also phrased as "job sharing."
That is the correct spelling of "work" (energy expended, or a job).
The plural form of the noun businesswoman is businesswomen.The plural possessive form is businesswomen's.example: Our agency is a businesswomen's resource for job hunting.
The plural form for the noun cow is cows. The plural possessive form is cows'.example: My first job was cleaning the cows' barn.
The correct spelling of the verb is employ (to utilize, or to provide a job).