simple present
1.arif go to campus everyday (+)
  arif does not go to campus everyday(-)
  does arif go to campus everyday(?)
simple past
2.dana ate pizza yesterday(+)
   dana did not eat pizza yesterday(-)
   did dana eat pizza yesterday(?)
present continuous
3.baihaki is praying in the mosque now(+)
  baihaki is not praying in the mosque now(-)
  is baihaki praying in the mosque now(?)
past continuous
4.condro was playing football (+)
   condro was not playing football(-)
   was condro playing football(?)