Examples:

about::

• There has been anger about his decision to buy the house with leaks in the roof. (Preposition)
• It started to rain when we're about ready to go picnicking on the river bank. (Adverb)
• She was so angry with me that she looked as if she was about to kick me. (Adjective)

above:

• His kite was flying high above the trees. (Preposition)
• We looked at the branches above for the owl that was hooting. (Adverb)
• Call the above number for more information. (Adjective) 

down:

• Our room is down the corridor on the left. (Preposition)
• The path zig-zags down to the sea. (Adverb)
• There was a dead body down in the ditch. (Adjective)  

in:

• There are too many raisins in her home-made cake. (Preposition)
• Who says you can just come in? (Adverb)
• This year, bald hairstyle is the in thing. (Adjective)

   

inside:

• Beautiful pictures of ugly witches can be found inside the book. (Preposition)  
• The book has beautiful pictures of blonde mermaids inside. (Adverb)
• The inside pages of the book have black and white pictures of rainbows. (Adjective)

   

off:

• This is the third time he's fallen off his horse. (Preposition)
• All of us were at the airport to see her off. (Adverb)                    
• You can’t put the kettle on to boil when the switch is off. (Adjective)

   

near::

• His ninety-nine-year-old grandmother keeps saying she is near death. (Preposition)
• She became more nervous as the day of her first delivery drew near. (Adverb)
• This stranger goes around telling everyone the world will end in the near future. (Adjective)

on:

• There are two flies on the cake. (Preposition)  
• Their argument went on till dawn. (Adverb)
• The match is on now if you still don’t know. (Adjective)

   

outside:

• There is a debt collector outside the door looking for you. (Preposition)
• The queue for the female toilets was so long, it stretched outside the building. (Adverb)
• They engaged an outside consultant for the project. (Adjective)

   

over:

• A crowd gathered to watch an object hovering over the mountain. (Preposition)
• My book got soaking wet when he knocked over my glass of juice. (Adverb)
• It was such an exciting march and it was over before we knew it. (Adjective)

   

past:

• You have to drive past the hospital to reach the morgue. (Preposition)
• He drove past sheep grazing in the fields. (Adverb)
• I have been looking for my missing puppy for the past one year. (Adjective)

   

round:

• We walked round the marketplace just for the fun of it, rather than to buy something. (Preposition)
• They gathered round to listen to his encounter with a wild dog. (Adverb)
• I saw two big, round eyes which must have belonged to an owl in that tree. (Adjective)

   

   

through:

• He learned to be a clown through watching his father in the circus. (Preposition)
• The bullet went through his right ear. (Adverb)
• The women’s team is through to the next round. (Adjective)

   

up:

• He lives here and the wife lives up the road. (Preposition)
• The men said they were digging up buried treasure. (Adverb)
• She was up all night baking a cake for her own birthday the next day. (Adjective)