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.