He writes
a letter. ( into
present continuos tenses )​

Um what exactly do you mean by that

He is writing a letter.

Explanation:

For present continuous tense, we add a helping verb IS in this case and add ing in the end of sentence.

the correct answer is c. he speculates on what might happen at given points in the future in a world without people. alan h. weisman is an american author, professor, and journalist. authors organize their information with a purpose. they present their ideas in an organized way. this is called text structure. weisman uses text structure so as to improve overall comprehension and to prove his points.