I know that include is a verb while including is a preposition but they made me confuse when it comes to their usage.
I usually confuse when to use include with including.
Most Thais like spicy food, (include/including) myself." (My guess is including)
Many Asians (include/including) Thais like to learn English." (My guess is including)
The price is (include/including) free-flow water." (My guess is include)
This book is (include/including) a free CD." (My guess is include)
Please give me an example of their usage.