... And I've just seen this now. MCF brochure? (CMIIW)
Well, yeah, these are indeed common mistakes. I don't know why, a whole lot of my friends actually
does these kind of mistakes... Oh, and the college English exam isn't that different. They didn't ask you to really write -- save for answering the questions asked in a reading passage -- and let's face it, they usually just flipped the question to a statement, then add the last part of the answer (Which you can copy exactly from the passage itself).
This is what my elementary school English teacher told us to do, and I think this might be one of the cause... Too much copy and pasting things leads to destruction in studies, right?
Luckily my native teacher told me to write a lot back then, though.
Wow, my National Final Exam is only two points from perfect.

Yeah, Junior High or Senior High, this is what I get. I tend to mess something up.

Honestly, I never cared about grammars, it just flows out. Not always right, but well, luckily most of the time it is, although I might make foolish mistakes at times...
I do agree though... We live in English environment, everything is in English. But... One thing I'd like to make a point of : Do not underestimate Google Translate.

I actually wrote about this in my recent Facebook status.
Are you dare to make something innovative?
Indonesian : Apakah kamu berani untuk membuat sesuatu yang inovatif?
Exactly word to word translation ~ This is Indonesian people.
(@Èxsharaèn : That part about watching movies without any subtitles... I did that a lot in high school. But then again, we went to the same high school

)
(Forgive my mistakes. I've been talking to an American and a Filipino a lot this week >< More like a practice, but yeah... Even people living in America makes mistakes in their grammar. Not that kind of mistake in the first post though, because that's really, really, really obvious.)