• Adverbial clause:
- যে সকল clause বাক্যে ব্যবহৃত হয়ে adverb এর কাজ করে, তাকে Adverbial clause বলে।

• আধুনিক ব্যাকরণে Adverbial clause এর প্রকারভেদের সংখ্যা উৎসের উপর নির্ভর করে কিছুটা ভিন্ন হতে পারে, তবে বেশিরভাগ ব্যাকরণ রেফারেন্স এবং পাঠ্যবইগুলোতে সাধারণত ৮ থেকে ১০টি প্রকার চিহ্নিত করা হয়।
- তবে Commonly Accepted Types (9 Types): অর্থাৎ, অধিকাংশ ক্ষেত্রেই ৯ প্রকার কে সঠিক উত্তর ধরা হয়।
1. Adverb clause of time.
→ Before she got home, she called and ordered a pizza.

2. Adverb clause of place.
→ They drove beyond where the city ends.

3. Adverb clause of reason or cause.
→ We adopted these two cats because they are a bonded pair.

4. Adverb clause of purpose.
→ We studied all night so we would pass the exam.

5. Adverb clause of condition or supposition.
→ We’ll be sitting in the conference room until they tell us to leave.

6. Adverb clause of concession.
→ Despite how I had good intentions, the interaction went horribly wrong.

7. Adverb clause of degree or comparison.
→ We expected the afternoon class to perform better on the test than the morning class did.

8. Adverb clause of manner.
→ She addressed the crowd as she had practiced in the mirror.

9. Adverb clause of result or consequence.
→ She was so tired that she fell asleep immediately.

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