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Tenses.
Pattern:
Simple Present Continous
(+) Subject + tobe(is,am,are) + Verb-ing + Complement
(-) Subject + tobe(is,am,are) not + Verb-ing + Complement
(?) tobe(is,am,are) + Subject + Verb-ing + Complement

Simple Past
(+) Subject + Verb Ii + Complement
(-) Subject + did not + Verb I + Complement
(?) Did + Subject + Verb I + Complement

1. Present Continous
(-) The girls are not playing basketball in the yard now.
(?) Are the girls playing basketball in the yard now?

2. Simple Past
(-) My mother did not cook beef steak last night.
(?) Did my mother cook beef steak last night?

3. Present Continous
(-) Anna is not typing a letter.
(?) Is Anna typing a letter?

4. Present Continous
(-) Caroline is not watching movie in the cinema.
(?) Is Caroline watching movie in the cinema?