State the function "s" in the following sentences. 1. the students watched the teacher with great attention. 2. peter's pen is on the table. 3. c has fewer keywords than pascal. 4. my friend studies at the university. 5. the teacher answered the students' questions.

1. "S" is used to make a plural of the word student. 2. Here "s" indicates a possessive structure stating that the pen belongs to Peter. 3. "S" is used to make a plural of the word keyword. 4. "S" is added to the word study because the sentence is written in present simple tense and is about a third-person singular noun. 5. Indicates plural possessive action because the teacher answered questions that were asked by more than one student.