Are there any grammatical errors or parts that don’t flow well?
Lies, no matter how small they are, can hurt people. The things you say carelessly can make someone sad. Unless you are careful about what you say and do, some unexpected problems may arise.
I don't like "unless" paired with "may". "
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I don't like "unless" paired with "may". Try "If you are not careful about what you say and do, some unexpected problems may arise."