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In denotes position inside something, while into denotes motion or direction towards the inside of something.
Always write the preposition into as one word.
Use by (not from) after the passive form to show the doer of the action.
Use to with distance, and till (until) with time.
Don't use for in the sense of about. The chief use of for is to convey the idea of being in favour of. If we say that the teacher spoke for bad habits it's like saying that he/she spoke in favour of bad habits!