how to correct english sentence?

oh, sometimes i read the english articles from books or on line, even though i can feel there must be sth. wrong in these sentences intuitionly, i'm always not sure of where the mistakes lie exactly. every time, i think them so hard for a long, long time, still failing to find any feasibility of problem solving. so i must ask for sb. to be my english teacher.

below are the records about "how to correct english sentence" between my teacher and me! i think it's such fascinating! you may as well have a good look at them! thank you!!!

??I told you before that you do not give yourself enough credit, and you just proved me correct. You are right about these sentences and I will explain them to you, but first I will help you. You stated "i can't still help shouting in my heart that god knows how lucky and pride i can have you as my private english teacher!!! ". The word pride should have been the word proud, but I am the lucky one to be able to have someone who I can help and who appreciates the help. Remember, I am here for you and will never think your questions are foolish. I am proud to have such a wonderful student.
?? On the first sentence, "Online advertising has reached new highs over the past few years. In 2008 whilst many offline companies were struggling to profit, online profits skyrocketed with online advertising spends up 21% despite the economic downturn." the mistake is that the word "with" should have been "while" or they should have used the word "spending" instead of "spends". Either one would be appropriate, but it would have to be one or the other, not both. Also, the word "to" needs to follow the word "up", so it would read "up to 21% despite..."
?? Now, on the second sentence, you are absolutely correct. The word should have been "where".
?? Again, I never think your questions are funny. And in America we think that the only stupid question is the one that wasn't asked, so ask your questions. Thank you for giving me the chance to help such a wonderful, wonderful person. (Yes, the use of the word "wonderful" twice is appropriate. It was used that way to stress the fact that I think you are too wonderful for it to be said only once).
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??Miss you,
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?? how are you? i think it has been several days since i sent you email last time. oh, i'm just a little busy due to the so-called "winalite"(MLM) www.winalite.comrecently.
?? oh, yes, you once told me, "you can notice quickly the poor use of english and you know i won't notice it because it is only through speaking it your whole life that you know when it doesn't sound right, just as i would know when someone has learned chinese as a second language. " oh, you're very right. my dear teacher. i always fail to tell the right use of english from wrong use of english. you know in fact i have a lot of such problems about english sentences during the reading. i'm a little afraid that you'll be tired of my foolish and easy questions. however, i can't still help shouting in my heart that god knows how lucky and pride i can have you as my private english teacher!!!
?? oh, i just met two english sentences which i think are wrong. but i can't know how to correct them.
?? below is one of them,
?? "Online advertising has reached new highs over the past few years. In 2008 whilst many offline companies were struggling to profit online profits skyrocketed with online advertising spends up 21% despite the economic downturn."
??my question: "spends" is a verb here? if it is a verb, we should delete the suffix "s",ok? because the subject "online projects" is "plural".
??another sentence is: "to work in an ethical enviroment were competition allows the application of initiative and team work in achieving organisational goals."
??oh, i think maybe it's a printing error. do you think if i can change "were" into "where"?
?? oh, i know my questions must be rather funny. but you're the best teacher i have ever met in this world. your answer is so detailed and clear.
?? i miss you! have a good day