Many people make mistakes for many different reasons and not all of them are because the person is uneducated. Speaking from personal experience, writer's block happens many times (and that's not just for ideas). Being able to read and write several different languages sometimes adds to this problem. Time of day, atmosphere, and lack of sleep can also make things difficult especially if there is a deadline to meet. I am a big fan of spell check and a second pair of eyes. After all we are human.
When it's your profession to write you must use every avenue available to circumvent these types of errors otherwise you will lose your audience. When I read something, I always consider the source, the intellectual thought being conveyed, the type of error, and the frequency of errors. But then again, that's just me.
"then" vs "than" and
"affect" vs "effect"
those are my two biggest errors that I constantly make. For me personally, it's not a lack of education. I know the difference and I know when I should use them. However, when I'm typing and my ideas are flowing I often just forget/don't think. It definitely keeps my editor employed.
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Let’s take a look at some of those writing mistakes many people make:
Interchanging “your” and “you’re”:
Another pesky mistake is switching “than” and “then”:
You should know the difference between “affect” and “effect”:
Semi-colons: why bother?
Commas can be overused.