Transform it into a compound sentence:
Because he was late, he missed the train.

• Correct Answer: ক) He was late, so he missed the train.

- মূল বাক্য: Because he was late, he missed the train.
- এটি একটি complex sentence, কারণ "because" একটি subordinating conjunction।
- Compound sentence তৈরি করতে হয় দুটি স্বাধীন clause এবং coordinating conjunction ব্যবহার করে।

- He was late, so he missed the train.
- সে দেরি করেছিল, তাই সে ট্রেন মিস করল।

• Other options:
খ) He missed the train although he was late. → এটি complex sentence (although = subordinating conjunction).

গ) He was late and he missed the train. → এটি compound হলেও মূল বাক্যের cause-effect অর্থটা স্পষ্ট না। "And" doesn’t show the reason.

ঘ) He was not on time as he missed the train. → এটি অর্থগতভাবে উল্টো এবং still complex.

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