18. He wanted to know if she knew Robert.

(Câu gián tiếp dạng Yes/ No question: S1+ asked+ ...+ if/ whether+ S2+ V(lùi thì))

19. She said that she had been very tired.

(Câu gián tiếp dạng tường thuật: S1+ said+ (that)+ S2+ V(lùi thì))

20. She said that she would get herself a drink.

(Câu gián tiếp dạng tường thuật)

21. He said that he could not drive them home.

(Câu gián tiếp dạng tường thuật)

I. Hoàn thành các câu trong bài câu tường thuật.
18. "Does she know Robert?" he wanted to know.
→ He wanted to know whether she knew Robert.
19. "I was very tired," she said.
→ She said that she had been very tired.
20. "I will get myself a drink," she says.
→ She said that she would get herself a drink.
21. "I cannot drive them home," he said.
→ He said that he couldn't drive them home.
Giải thích: Theo quy tắc lùi thì của câu gián tiếp.