"Were they writing the letters in English, instead of their own language?"

During this time, she also started writing short stories in English.

He was one of the first writers to write in English.

He also wrote a number of books and articles in English.

That is what children need to learn for reading and writing in English.

This was also the first book that she wrote in English.

She has written and recorded some of her music in English.

While there, she wrote in English and published two short stories.

The book was written in English and numbers 198 pages.

He wrote in English for everyone's benefit, and was still learning.