Read these sentences and choose the correct variant. (Прочитай предложения и выбери правильный вариант.)

1.
I am writing a letter to my friends in Spain now.
I write a letter to my friends in Spain now.

2.
My dad is buying a new book today.
My dad is buy a new book today.

3.
She is opening the window now.
She iss opening the window now.