1 How to do that? 2 How to approach this? Do these sentences need interrogative mark?
In what cases, ? symbol can be avoided? Suppose sentence start with How as in above two sentences.
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How to punctuate is a matter of emphasis and context. – Jason Bassford Feb 25 '19 at 21:38
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Are they actual questions (what is the best way to do that?) or headings for a description of how to do it? If they are not questions, they don't need a question mark. – Kate Bunting Feb 26 '19 at 08:56