Need help with Vents

I'm reallllly confused with vents. Can anyone help me? Or is there any informatory websites that breaks it down in a simple and easy to understand way? I'm confused about the types:

Negative Pressure Ventilation

Positive Pressure Ventilation

Volume-targeted Ventilation

Pressure-targeted Ventilation

High-frequency Ventilation

and the modes:

Controlled mechanical ventilation

Intermittend mandatory ventilation

Synchronized IMV

Pressure Support

Inverse Ratio ventilation

PEEP

Cpap

Im so frustrated and confused! Ive been in the ICU for 5 weeks and I've never had a patient on a ventilator. But then I have a quiz on this on Thursday so I've got to get this all figured out very sooon. I asked my instructor if I could have a ventilator patient tomorrow at clinical so hopefully that helps!

I can't believe you've been in the ICU for 5 weeks and not had someone on the vent. I have a hard time finding pts not on vents! My best advice would be to hit up your RT, and ask them to explain it all to them. When I was going through ICU theory in NS, I just asked my fav RT, and he made it all so simple.