He speaks as though knew everything.

You must do the work before a week.

= You will do the work before a week.

I got the work done by him.

He knows swim.

= He knows how to swim.

The colour of his eyes is blue.

He ran away having taken the money.

Karim liked the late spring (Make it interrogative) 

= Didn't Karim like the late spring.

In spite of his working hard, he failed in the examination (Make it interrogative). 

= Though he worked hard, he failed in the examination.

When he was four, he left his village (Make it complex). 

= At the age of four, he left his village.

Twenty years ago, I was leaving in Paris (Make it compound).

= It was twenty years ago and I was living in Paris.

Work hard or you can not prosper in life (Make it complex). 

= Unless you work hard, you cannot prosper in life.

International Mother Language Day

International Mother Language Day is celebrated every year on February 21. It honors linguistic and cultural diversity worldwide. UNESCO proclaimed this day in 1999. The day commemorates the events of 1952 in Dhaka, Bangladesh. In 1952, students were martyred for advocating the recognition of their mother language, Bangla. The day highlights the importance of preserving native languages. These languages are crucial for cultural identity and heritage. Events like cultural programs, language festivals, and educational activities are held globally. Schools conduct special classes and activities to raise awareness among students. The day promotes unity and understanding among different linguistic communities.

By dint of = বদৌলতে

Come to light = প্রকাশ হওয়া

This is a unique case.