Let´s imagine that you have a can in front of you, if I say: "the can contains/includes some vegetables" then there are vegetables inside the can... contain and include are synonims, mean the same but are written in a different way. if I say: "the can is involved by a piece of paper" then there is a piece of paper that surrounds the can. if I say: "the can consists of aluminum" then the material from which the can has been made of is aluminum. Hope I helped you to clarify your question, My name is Uri Quintal and I am a profesional online ESL teacher. If you are looking for someone who can help you to increase and develop your English skills, please do not hesitate to contact me. I offer some basic courses which are focused on helping students not only to speak another language but to think in another language for a very cheap price, you can find me on skype as UriQuintal, have a nice day! :)

contain: to hold incude:To add someting involve: can mean to include(to add) or to participate depending on how you choose to use them consist:to be made of I hope it helps /.\