Present Continuous Tense

Rumus
   Positive:
        S+To Be (am/is/are)+Present Participle (ing form)
   Negative:
        S+To Be (am/is/are)+not+Present Participle (ing form)
   Interrogative:
        To Be (am/is/are)+S+Present Participle (ing form)

Information:
This tenses usually used to express in progress actions

Example:
(+)We are eating cake now
(-)We aren't eating cake now
(?)Are we eating cake now?