* As a noun phrase: Students' work (possessive case, showing the work belongs to the students)
* As a verb phrase: Students work (present tense, indicating what students do)
* As part of a sentence: The students work hard. (subject and verb, indicating the students are doing something)
Here are some examples:
* "Students' work is on display in the hallway." (noun phrase)
* "Students work on projects in groups." (verb phrase)
* "The students work diligently on their assignments." (sentence)
Remember to consider the meaning you want to convey when deciding how to punctuate "students work."