Use "advise" as a verb meaning to give counsel or to give an opinion. Here are some correct examples: (1) I advise you to start exercising more. (2) The professor advised me to take algebra. Notice that you put a subject or doer before the verb "advise." In example (1), the subject is "I," and in example (2), it is "The professor."
Use "advice" as a noun meaning the counsel or opinion that is given. Here are some correct examples: (1) His advice was to save for retirement. (2) The professor gave me good advice. As a noun, "advice" fills the usual positions for a noun. In example (1), "The advice" is the subject of the sentence. In example (2), "advice" is the direct object of the verb "gave."
Practice by choosing the correct word in the following exercises. Answers are in the Tips section. (1) Can you (advise/advice) me on what to wear? (2) I followed his bad (advise/advice) and lost my money. (3) My teacher (advises/advices) me to work harder if I want to pass the class. (4) Good (advise/advice) is hard to find. Just remember that "advise" is a verb and "advice" is a noun, and you will always use these words correctly.