• "If the door is locked, what shall I do?" she wondered to herself.
  → She wondered what she should do if the door was locked.

• "If I were you, I'd read the exam questions very carefully," said the teacher to us.
  → The teacher advised us to read the exam questions very carefully.

• "It's better to have the theater built next to the town hall," they said.
  → They offered to have the theater built next to the town hall.

• "Okay, I'll collect David from school," said his father.
  → David's father promised to collect David from school.

Câu 18:

• Câu trực tiếp: "If the door is closed, what shall I do?" she said to herself.
• Câu gián tiếp: She wondered what she would do if the door was closed.
  • Giải thích:
    • Động từ tường thuật: wondered (tự hỏi)
    • Thay đổi ngôi: I -> she
    • Thay đổi thì: shall -> would
    • Câu điều kiện loại 1 giữ nguyên hình thức

Câu 19:

• Câu trực tiếp: "If I were you, I'd read the exam questions very carefully," said the teacher to us.
• Câu gián tiếp: The teacher advised us to read the exam questions very carefully if we were her.
  • Giải thích:
    • Động từ tường thuật: advised (khuyên)
    • Thay đổi ngôi: I -> her, you -> us
    • Câu điều kiện loại 2 giữ nguyên hình thức
    • Cụm động từ to infinitive: to read

Câu 20:

• Câu trực tiếp: "It's better to have the theater built next to the town hall," they said.
• Câu gián tiếp: They suggested that the theater should be built next to the town hall.
  • Giải thích:
    • Động từ tường thuật: suggested (đề nghị)
    • Câu tường thuật gián tiếp với that-clause: that + S + should + V
    • Thay đổi cấu trúc câu: It's better to V -> suggest that S should V

Câu 21:

• Câu trực tiếp: "Okay, I'll collect David from school," said his father.
• Câu gián tiếp: David's father promised to collect David from school.
  • Giải thích:
    • Động từ tường thuật: promised (hứa)
    • Cụm động từ to infinitive: to collect