1. Colors make up our world.
2. Our world is made up of colors.
3. Our world is made up by colors.
(Is #2 the passive form of #2? What about #3? Is #3 the passive form of #1?)
Yes, # 2 is the passive form of # 1. We wouldn't use # 3.
I believe there may be a typographical error in your question. You mentioned both #2 and #2, which seems to be a repetition. However, I can still help clarify the differences between the three statements you provided.
1. "Colors make up our world." - This is an active sentence, where "colors" are the subject and "make up" is the verb phrase. It states that colors are the components that constitute or form our world.
2. "Our world is made up of colors." - This is a passive sentence, where "our world" is the subject and "is made up of" is the verb phrase. Here, the focus is on the world being composed of colors, rather than the colors themselves.
3. "Our world is made up by colors." - This sentence is grammatically incorrect. The correct version would be "Our world is made up of colors," which we discussed in statement #2.
To summarize, statement #2 is indeed the passive form of statement #1, but statement #3 is an incorrect variation that does not match either of the original statements.