Simple. First you would make an outline coming up with the reasons that support your subject. Then next you would fill them in a straight line down. So to start your intro write a hook to grab your readers attention. Then after write your supporting reasons after. Thats the intro. After your intro to write your first paragraph write your claim and counterclaim. Like if i was going to say dogs are better then cats i would write"Although dogs are popular pets so are cats but are preferred as they cost less due to survey done by geoplanet or some other company name." The write a another sentence like the first followed by a second just like i did above a topic as well as supporting factor. Then for your second paragraph use your second reason as well as a supporting detail following the same format as your first and then third if your teacher requires it. Then for a conclusion write something like In conclusion "dogs are better since they cost less, love to play, and are good for protection against burglars" to sum up your three reasons.
Certain characters in a story could seem one way but turn out to be different in the end. For example, a character could be nice throughout the entire story up until the turning point. This certain character could turn out to be the antagonist after all and we wouldn't suspect It or vice versa. The antagonist could turn into a protagonist towards the end. It all depends on how the character is developed and presented.
Addy and I support each other.
Andrew and Brooke annoy each other.
It is not “one another” in any case. Each other is for 2 individuals; “one another” is used for 3 or more people