I think here it means "ironic" or "fitting"

A "quibbler" is someone who is always trying to start a fight. They like to argue about everything they can. A "sophist," however, is someone who uses a clever but fallacious argument. Sophists don't necessarily pick fights; they just try to outsmart you when there's already an argument. To answer your question, quibblers don't necessarily use tricky words, although sophists do. Rather, quibblers like to quibble, while sophists like to sound clever.

You're right, Americans tend not to fully pronounce the "o" vowel sound when "of" comes before a consonant; instead, we give a little unstressed vowel sound, called a schwa. This sound occurs a lot in English (at least in American English).

I would recommend reading good English books and watching English television shows. Children who speak English often improve gradually over time through immersion. Children are surrounded by the language, so of course they improve. You also have to surround yourself with English if you want to get better. So, I recommend reading some grade-school level books for native speakers, and watching television shows intended for a young audience; perhaps some Disney shows would be good. Specifically, I read these books when I was younger: -The Magic Treehouse Series -The Boxcar Children Series -The Hardy Boys Mystery Series Good luck improving your grammar!

I think you've hit upon it--"best of luck" is just a more intense form of "good luck".

Nope, those don't sound odd at all; in fact, they sound very natural and native, although they are a bit dated. If you use them in conversation, people might think you're being quaint. But in 19th century literature, this form is used all the time.

You might check out khan academy's grammar course. It's for native speakers but I'm not sure how "advanced" it is. But it's free!

Batman, I would recommend reading classic English literature. English literature has a rich history, and in my opinion is some of the best in the world. For an extensive, thorough vocabulary, I would recommend reading books from different periods, as this will help you see the development of the language. For example, reading Dickens would be excellent for your vocabulary, but people don't talk like that anymore. Another reason I recommend reading is that reading will enable you to remember words in context. If you are struggling to remember a definition, just think back to the sentence where you first encountered the word, and you may find that you can remember the definition. If you do decide to read, I would recommend these authors: -Charles Dickens (19th century) -Jane Austen (19th century) -JK Rowling (modern) -CS Lewis (20th century) -Mark Twain (American, 19th century) I would also recommend Shakespeare (16th century), but his work can be confusing because the language is outdated, so I don't think Shakespeare would be good for your vocabulary. However, he is one of the greatest authors of all time. Not only can you read English authors, but you can read foreign authors translated into English. Some excellent books: -Don Quixote -The Odyssey -Crime and Punishment In addition, read some great books from your native language that have been translated into English. Be sure to choose a well-known book, because otherwise you might get a poor translation. Reading books you are familiar with will help you to get the "feel" of a certain word even without knowing the exact definition. One book that is excellent for this (I find) is the Bible. However, if you're not familiar with the Bible, choose another familiar book. Good luck! I hope you find that reading English literature is both enjoyable and helpful in developing your vocabulary!