Present tenses
(+) i go to school
(-) i don't go to school
(?) do you go to school?
present continuous tenses
(+) she is crying because him
(-) she isn't crying because him
(?) is she crying because him?
present perfect tenses
(+) she has swept the floor
(-) she hasn't swept the floor
(?) has she swept the floor
present perfect continuous tenses
(+) we have been studying english
(-) we haven't been studying english
(?) have we been studying english?
past tenses
(+) they spoke english loudly
(-) they didn't speak english loudly
(?) did they speak english loudly?