Basic English grammar. It's one of the most important things you can learn in your lifetime, because it enables you to express yourself clearly without appearing to be ignorant or stupid. Yet it does not seem to be taught in the schools these days. The mistakes in grammar that otherwise intelligent people commit are appalling. Nothing is worse when making an impression on other people than bad grammar, with the exception of bad spelling, and not being able to write, but being forced to block-print like a retarded 5-year-old.
Language is literally the basis of thought. If you cannot express yourself properly, you cannot think properly.
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