"How to be perfect"
Someone told me that because the sentence above is not a complete sentence, it must not have a punctuation.
Another told me that it is a statement and said it requires a full-stop.
I searched for the rule of punctuations: there is no such rule that an incomplete sentence must not have a punctuation, but I'm none the wiser.
Can someone enlighten me?
If a grammatically incomplete sentence is used within text as a sentence then it should have a full stop (or other stop, as appropriate). g. as a heading, then it may not need one.
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If a grammatically incomplete sentence is used within text as a sentence then it should have a full stop (or other stop, as appropriate). If it is used in some other context, e.g. as a heading, then it may not need one.
If we take as a working definition a sentence to be an expression that begins with a capital letter and ends with some terminal mark, then your example does require a full stop to qualify as a sentence, such as might be found in a newspaper or magazine article:
How to be perfect.
Or perhaps with a question mark:
How to be perfect?