1) The journal examines three systems.
Does the journal examine three or five systems?
What does the journal examine?
Who examines three systems?
2) The students read a lot of litereture.
Do the students read a lot of litereture or magazines?
What do the students read?
Who reads a lot of litereture?
3) Dr.B analyzed any complex prolems.
Did Dr.B analyze any complex prolems?
What did Dr.B analyze?
Who analyzed any complex prolems?