The plural of janitor is janitors.
If janitors is simply a plural word, then it doesn't need an apostrophe. Janitor's is a singular possessive (Janitor's responsibilities). Janitors' is the plural possessive (Janitors' responsibilities).
A possessive shows ownership. If a janitor has a house, we'd say it was the janitor's house. Just add an apostrophe + s to any regular singular noun, then add what that noun owns (or possesses) to get the possessive form. Here are a few examples: the janitor's bucket, the janitor's son, the janitor's uniform. Here are some others: The teacher's smile was sweet. I saw the robin's eggs in a nest. When the boy's shoelaces came loose, he tripped on Joe's bookbag. Look at the nouns that follow the possessive form. Ask yourself, "Who owns it?" The answer is~ the teacher, the robin, the boy, Joe. Or, for your question, the janitor. I just heard the janitor's keys in the hall. Who owns the keys? The janitor. The apostrophe is added AFTER the owner and is followed by an "s" for a singular, regular noun.
janitor janitor janitor
No, he was not a janitor.
He sold pens
You could purchase a janitor cart at Home Depot. They offer many janitor carts and they provide janitor carts at a cheap price. These janitor carts are very durable as well.
The janitor mopped the school hallway.A janitor cleans, mops, dusts, as well as keeps the heat and air conditioning running well.He gave the school janitor a Christmas card.
The ISBN of The Janitor's Boy is 9780689835858.
Janitor Joe was created in 1984.
Janitor Joe happened in 1984.
George the Janitor was created in 1974.
The janitor has to clean the school.