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my electronic dictionary sucks because it doesn't have many words that i wanted to know about.

-->give examples...that solidify your argument.

in my opinion, my stat teacher sucks because he does not expalain the material very well. in fact i have diffiulty to understand his english (he is not native)

-->Many of my friends say that he does not explain the material clearly either. Therefore, this statement solidify my argument. the fact that he has some strange accent makes my argument strong.

-->The fact that he doesn't expalian very well doesn't mean he is not a smart guy. from his regume, i can assume that he is doing well in his academic career.