Present Simple
+ Sheila loves to play guitar.
- Sheila doesn't love to play the guitar.
? Does Sheila love to play the guitar?
to be
+ They are always late.
- They aren't always late.
? Are they always late?
Present Continuous
+ Sheila is playing the guitar right now.
- Sheila isn't playing the guitar right now.
? Is Sheila playing the guitar right now?
I am
you are
he
she is
it
you
we are
they