মূল তথ্য:

• Mark Twain একজন American humorist, journalist, lecturer, এবং novelist।

• তিনি ভ্রমণবিষয়ক বর্ণনা ও শিশুদের অ্যাডভেঞ্চার গল্পের

সঠিক উত্তর — ক) Put the book back on the shelf.

• এখানে back verb (put)-কে modify করছে, অর্থাৎ "আগের জায়গায়" বা "ফিরিয়ে" দেওয়া বোঝাচ্ছে।
 এটি adverb।

Options:
খ) He was lying on his back on the sofa.
→ back এখানে noun (পিঠ)।

গ) We were sitting in the back row.
→ back এখানে adjective (row-এর অবস্থান বোঝাচ্ছে)।

ঘ) We drove along miles of twisty back roads.
→ back এখানে adjective (roads-এর ধরন বোঝাচ্ছে)।

Back: [adverb]

• English meaning: to or into the place, condition, situation or activity where somebody/something was before.

• Bangla meaning: আগের অবস্থান, অবস্থা বা কাজে ফিরে যাওয়া।

Example:

• When is he coming back to work?

• He'll be back on Monday.

• Don't forget to bring it back when you've finished with it.

Back: [noun]

• English meaning: the part of the human body that is on the opposite side to the chest, between the neck and the tops of the legs; the part of an animal’s body that corresponds to this.

• Bangla meaning: (মানবদেহ সম্বন্ধে) পিঠ; পৃষ্ঠদেশ; মেরুদণ্ড।

Example:

• He was lying on his back on the sofa.

Back: [adjective]

• English meaning: located behind or at the back of something.

Example:

• We were sitting in the back row.

• We drove along miles of twisty back roads (= away from the main roads).

Source: Oxford Dictionary.

• The idiom "a brown study" means – Deep and serious thought.

• a brown study (idiom)
English Meaning: a state of deep, serious, or melancholic thought.
Bangla Meaning: গভীর এবং চিন্তামগ্ন ভাবনা; বিমর্ষ বা চিন্তিত অবস্থায় নিমগ্ন থাকা।

Example Sentence:
– He sat in a brown study, unaware of the conversation going on around him.