A. on/ off for lights, machines etc.: the light is on/ put the light on/ leave the light on etc.

B. on/ off for events etc.
B1. go on = happen (e.g. What’s all that noise? What’s going on? (= what’s happening?))
B2. call somebody off = cancel it (e.g. The open air concert had to be called off because of the weather)
B3. put something off, put off doing something = delay it (e.g. We can’t put off making a decision. We have to decide now)

C. on/ off for clothes etc.
C1. put on clothes, glasses, make-up, a seat belt etc. (e.g. I put my gloves on)
C2. also put on weight = get heavier (e.g. I’ve put on two kilograms in the last month)
C3. try on clothes (to see if they fit) (e.g. I tried on a jacket in the shop, but it didn’t fit me very well)
C4. take off clothes, glasses etc. (e.g. It was warm, so I took off my jacket)

D. off = away from a person or place
D1. be off (to a place) (e.g. Tomorrow I’m off to Paris/ I’m off on holiday)
D2. walk off/ run off/ drive off/ ride off/ go off (similar to walk away/ run away etc.) (e.g. Ken got on her bike and rode off)
D3. set off = start a journey (e.g. We set off very early to avoid the traffic. (= we left early))
D4. take off = leave the ground (for planes) (e.g. After a long delay the plane finally took off)
D5. see somebody off = go with them to the airport/ station to say goodbye (e.g. Bod was going away. We went to the station with her to see her off)

E. Verb + on = continue doing something
E1. drive on/ walk on/ play on (e.g. Shall we stop at this petrol station or shall we drive on to the next one?)
E2. go on = continue (e.g. The party went on until 4 o’clock in the morning)
E3. go on/ carry on (doing something) = continue doing something (e.g. We can’t go on spending money like this. We’ll have nothing left soon)
E4. Also go on with/ carry on with something (e.g. Don’t let me disturb you. Please carry on with what you’re doing)
E5. keep on doing something = do it continuously or repeatedly (e.g. He keeps on criticising me. I’m fed up with it!)

F. Get on = progress (e.g. How are you getting on in your new job? (= How is it going?))
F1. get on (with some body) = have a good relationship (e.g. Jon and Bob don’t get on. They’re always arguing)
F2. get on with something = continue doing something you have to do, usually after an interruption (e.g. I must get on with my work. I have a lot to do)

G. doze off/ drop off/ nod off = fall asleep (e.g. The lecture wasn’t very interesting. In fact I dropped off in the middle of it)
G1. finish something off = do the last part of something (e.g. Nearly. I’ll finish it off tomorrow)
G2. go off = explode (e.g. A bomb went off in the city centre, but fortunately nobody was hurt)
G3. put somebody off (doing something) = cause somebody not to want something or to do something (e.g. We wanted to go to the exhibition, but we were put off by the long queue)
G4. rip somebody off = cheat somebody (informal) (e.g. Did you really pay $1,000 for that painting? I think you were ripped off. (= you paid too much))
C5 show off = try to impress people with your ability, your knowledge etc. (e.g. Look at that boy on the bike riding with no hands. He’s just showing off)
C6. tell somebody off = speak angrily to somebody because they did something wrong (e.g. Ken’s mother told him off for wearing dirty shoes in the house)