Transform it into a complex sentence:
He was too tired to walk.

• সঠিক উত্তর: ক) He was so tired that he could not walk.

- মূল বাক্যটি হলো: "He was too tired to walk."
- এটি একটি simple sentence যেখানে "too...to" structure ব্যবহৃত হয়েছে।
- "Too...to" structure-কে complex sentence-এ রূপান্তর করতে হয় "so...that" ব্যবহার করে।
- তাই "He was so tired that he could not walk." হলো সঠিক complex রূপ।
- বাক্যটি এখন একটি complex sentence যেখানে "that he could not walk" একটি subordinate clause.

• Other options:
খ) He was very tired and walked slowly. → এটি একটি compound sentence, অর্থ বদলে গেছে।

গ) He walked but was tired. → এটিও compound sentence, "too tired to walk" ধারণা নেই।

ঘ) He was too tired and walked slowly. → অর্থ ও structure দুটোই ভুল; পরিবর্তনটি সঠিক হয়নি।

Source: A Passage to the English Language, S.M. Zakir Hussain.