Instead of looking for a grammatical explanation for the use of a word or phrase, it's often better to search for real examples of usage.
Take the following question, for example. A student asked me:
Is there a difference between "in terms of" and "with regard to"? When and how should we use these phrases?
Can you find 3 examples of each of the two phrases in the student's question above? Use a search engine, such as Google, and choose examples that come from reliable sources (e.g. newspaper articles). Does this help you to see how and when the two phrases are used? Do you think there is a difference between them?