Hope vs. WishHow to use "hope" and "wish" correctly
You hope that something will come true or that something is true when there is a real possibility; you wish that something were true when you know there is no such possibility. The verb wish is often used with other verbs in the subjunctive mood.
I wish that he is all right.
I hope that he is all right. (He might actually be o.k.; his condition is unknown.)
I wish that he were all right. (subjunctive mood: I know that he is not all right.)
I wish that I will be able to go.
I hope that I will be able to go. (There is a possibility that I will be able to go.)
I wish that I were able to go. (subjunctive mood: I know that am not able to go.)
Common Errors in English Usage: Errors in diction and idiom commonly made by native speakers of English
List of Common Errors in English Usage (PDF): Printable version of the complete list
Common Grammar Errors: A list of common errors in grammar (topics like subject-verb agreement and parallelism) as distinct from usage