|before action verbs
write, hit, make, drive, move, wash, drop, etc.
The car slowly rolled into the intersection.
Stacy clearly made her point.
|after be verbs
is, am, are, was, were
I am almost finished.
He is very angry.
|sometimes and usually can be moved around||Sometimes, the offices are open late.
The offices are open late, sometimes.
The offices are sometimes open late.
Usually, this device detects all movement.
This device detects all movement, usually.
This device usually detects all movement.