yes you do.
Double quotation marks, or so called speech marks, can be used anytime you want to set off words or sentences as dialogue. Single quotes, italics, or bold can set off a single word or phase that is not dialogue but simply for 'emphasis'.
Italics(:
Yes, you can use italics for emphasis in your writing.
Italics are intended for sparingly use, only on a word or phrase. Therefore, you should not italicize a whole paragraph. The only time this may differ is if quoting a whole paragraph and if following certain style rules. You would highlight the entire paragraph, and click on the Italics button in MS Word.
Italics in brackets are often used to denote a change or emphasis added by the person quoting the text, rather than a part of the original quote. This helps distinguish the modifications made by the quoter from the original text.
It is more common in journalism to use italics for the title of a newspaper. This helps differentiate the title from the rest of the text and conforms to AP style guidelines.
Writers use italics to emphasize words or phrases, and sometimes to indicate thoughts.
Italics
No. Use italics or underline (I believe italics is the most current format).
Use Bold, Italics or underline it.
italics
Yes, it is possible to use italics in a haiku by emphasizing certain words or phrases to add depth and nuance to the poem. However, it is important to ensure that the use of italics complements the overall structure and theme of the haiku without overshadowing its traditional form and essence.