six years in my childhood. B. which C. that D. whose Ex2. Choose A, B, C or D to indicate the underlined part that needs correction in each of the following questions. 11. The waiter whom severed us yesterday was polite and friendly. B who C D 12. This class is only for people who's first language is not English. C 13. This is the boy who sister studied with me at high school. C D 14. He is moving to Lang Son city that is in the north-east of Viet Nam. A B C 15. The girl whom is standing over there is from England. A CD

## Ex1: <br /><br />The correct answer is **C. that**.<br /><br />* **Explanation:** The sentence needs a relative pronoun to connect the two clauses. "That" is the correct choice because it refers to a thing (the six years) and can be used in both restrictive and non-restrictive clauses.<br /><br />## Ex2:<br /><br />Here's the breakdown of the errors and corrections for each sentence:<br /><br />**11. The waiter whom severed us yesterday was polite and friendly.**<br /><br />* **Error:** "Whom" is used incorrectly. "Whom" is used for the object of a verb or preposition, but here, "waiter" is the subject of the verb "severed."<br />* **Correction:** **B. who** (Who is the correct pronoun for the subject of a verb)<br /><br />**12. This class is only for people who's first language is not English.**<br /><br />* **Error:** "Who's" is a contraction of "who is" and is incorrect here. We need the possessive form of "who" to modify "first language."<br />* **Correction:** **C. whose** (Whose is the possessive form of "who")<br /><br />**13. This is the boy who sister studied with me at high school.**<br /><br />* **Error:** The sentence lacks a noun after "who." It should be "whose sister" to show possession.<br />* **Correction:** **C. whose** (Whose is the possessive form of "who")<br /><br />**14. He is moving to Lang Son city that is in the north-east of Viet Nam.**<br /><br />* **Error:** The relative clause "that is in the north-east of Viet Nam" is non-restrictive, meaning it provides additional information. Non-restrictive clauses need commas.<br />* **Correction:** **C. that, is** (Add a comma after "city")<br /><br />**15. The girl whom is standing over there is from England.**<br /><br />* **Error:** "Whom" is used incorrectly. "Whom" is used for the object of a verb or preposition, but here, "girl" is the subject of the verb "is standing."<br />* **Correction:** **A. who** (Who is the correct pronoun for the subject of a verb) <br />