Phrasal verb prepositions: 'BACK' part 01 - The basic meaning of 'BACK'

In this video, I explain the basic or ‘core’ meaning of the preposition “BACK” and how it can be used with phrasal verbs.

[mairacirino]

Wonderfulll!!! You came back! Love your videos! They´s been helping me a lot to have a solid background in Phrasal Verbs!!II

[JoseAntonio-exep]

Thank you, sir. Your lessons are easily understood. Keep it up. Cheers.

[kingdomofknowledge]

Please make a video on "of" and "at"..

[hocinerebahi]

But why you didn't carry on your videos explaining the other meanings of back ?

[debughosh]

Sir, if I say,
Turn back.
Does it mean you move behind.
Sir, please help me to understand.

[theophonchana]

"Back" isn't a preposition.