Father said to his son, "Work hard to achieve your goals." (make it indirect)

Correct answer: Father advised his son to work hard to achieve his goals.

• Imperative Sentence- এর Direct speech কে Indirect speech এ রূপান্তর করার নিয়ম:
- Reporting verb এর পরিবর্তে Order/ command/ advise/ tell বসে,
- Direct speech এ অনুরোধ বুঝালে request বসবে, আদেশ বুঝালে command/order বসবে, উপদেশ বুঝালে advise বসবে,
- Inverted comma উঠে গিয়ে to বসে;
- তবে, Negative sentence এর ক্ষেত্রে not to বসে,
- Reported speech এর মূল verb থেকে শেষ পর্যন্ত বসে,
- Structure: Subject + request/ order/ advise/ tell/ instructed + object (যদি থাকে) + to + reported speech এর মূল verb থেকে শেষ পর্যন্ত বসে।

• প্রদত্ত বাক্য: The teacher said to the students, "Read attentively to pass the exam."
- Direct speech-এ "Read attentively to pass the exam." বাক্যটি দিয়ে একজন teacher তার students দের উপদেশ দিয়েছেন।
- নিয়মানুযায়ী উপদেশ বুঝালে Reporting Verb (said to) পরিবর্তিত হয়ে advised বসে।
- তাই সঠিক উত্তর: The teacher advised the students to read attentively to pass the exam.

Direct: Father said to his son, "Work hard to achieve your goals."
Indirect: Father advised his son to work hard to achieve his goals.

Source:
1. Advanced Learner's Communicative English Grammar & Composition By Chowdhury & Hossain.
2. Website English Wizard by Saleh Ahmed.