thank you paul :)

In terms of writing, they are alternative spelling forms of the same word and both are correct. However, as the pronunciation goes more towards a U sound than an A sound, when you are speaking or writing maybe using " further" and "furthest" would be better. So, in terms of sound it's: base form = far; comparative = further than; superlative = the furthest. Hope this helps

how can you write a comment?

i believe you :p

I can't see your question