Don't confuse "legal" (in compliance with the law) with "valid" (in compliance
with some constraint).
• Don't confuse "its" (possessive form of "it") with "it's" (contraction for "it is").
• Write "because" instead of "as" if you are showing a causal relationship.
• Write "although" or "whereas" instead of "while" if you are describing a
contrasting example.
• Don't say "issue" when you mean "problem" or "difficulty".
• Don't say "as such" when you mean "therefore" or "so".
• Write "different from" or even "different to" instead of "different than", which is
unacceptable.
• Don't use "while" or "meanwhile", which position events in a time line, to mean
"but" or "however".