'The minister took a small cabin.' The complex form is-

• Simple Sentence এ infinitive to থাকলে Complex Sentence এ রূপান্তর করার নিয়ম:
- to এর স্থলে In order that অথবা So that যুক্ত sub-ordinate clause ব্যবহৃত হয়
- এরপর noun phrase + may/might বসবে।
- Present tense এর ক্ষেত্রে may এবং Past tense এর ক্ষেত্রে might বসে।

• নিয়মানুসারে সঠিক উত্তর - The minister took a cabin that was small.

Examples:
Simple: We earn money in order to live a happy life.
Complex: We earn money so that we may live a happy life.

Simple: He studied hard in order to pass the exam.
Complex: He studied hard so that he might pass the exam.

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