1. What is the difference between "I hope I can" and "I hope I could"? 2. How about "might" versus "may"? 3. Why would a person say "I was wondering if..." instead of "I am wondering if..." when he is still wondering about the question at the time of the question? Is this just a matter of preference? 4. When we review a book, why do we say "I thought" instead of "I think"? Isn't it a given that whatever we thought is probably still true at the time we review the book? 5. When we write about someone who everyone knows is already dead, when can we use "is" and when can we use "was"? 6. Lastly... is the phrase "grammar errors" or "grammar questions" grammatically correct? I assume the word "grammar" is a noun and two nouns just don't go together. That's all for now.