Confusable words

Many words can be confused with other words (or even with non-words!). For example, when do you use bad or badly? Continually or continuously? See if you know the correct word in the sentences below!

1. “Bad” or “badly”?
2. “Continually” or “continuously”?
3. “Fewer” or “less”?
4. “Farther” or “further”?
5. “Irregardless” and “regardless” are often confused. Which of the following is correct?
6. “Seldom” or “seldomly”?