(+) Budi writes a letter.
(-) Budi doesn't write a letter.
(?) Does Budi write a letter?

(+) Ari reads a book.
(-) Ari doesn't read a book.
(?) Does Ari write a book?

(+) They go to school.
(-) The do not go to school.
(?) Do they go to school?

(+) We get money.
(-) We don't get money.
(?) Do we get money?

(+) He is a teacher.
(-) He is not a teacher.
(?) Is he a teacher?