Explanation: “When terms like now, right, at present, at this time/moment, today, day by day, gradually, year after year, etc., are mentioned and something ongoing in the present is being indicated, the verb is in the present continuous tense.”

Therefore, the correct answer here is “D. am writing”

So we thing you get answer of “I____a letter to my sister now.“ If you understand this rule you can answer this question. Answer this question in the comment box.

➡️Right now, I _______ (study) for my final exams.

A. study
B. am studying
C. studied
D. studies