Yes. Indicate a quote within a quote by using single quotation marks rather than double ones.
Quotes....
It depends on your settings on your program you are using.
No
No.
possibly
No, you don't. You only put quotes around what someone is sayng. For example or what someone is saying: "I can go to the grocery store,"
no i think you underline it
No, quotes are for quoted material only.
In a story, it is not necessary to put quotes around a road sign. Simply italicizing the text of the road sign is sufficient to indicate that it is separate from the rest of the narrative.
If you put quotes around it or include it in a bibliography, then it is not plagiarism.
Yes, the only effective way of searching for two words is to put quotes around the two (or more) words.
nautraully, you put quotes when reffering to a very specific song.