I'd use and teach 'whether', but is 'if' wrong? Some would use it.
'unless' and 'otherwise' are wrong.
i want to thank you for doing this site.
I tihnk that If is possible here,unless and otherwise are tottaly false while whether is 100 per cent correct!thank you for this aailable site
eh..if u sayin 'whether' innit supposed 2b lyk this==> i doubt whether hell be there(+ OR NOT) ? o_0...but on the other hand we cant use [if + future ] always 'if + present = present / future) or if + unreal past/ p.perfect)
p.s. scroll up & ull c that the sentence can stand without ne of em!! *.*
I chose 'if', but I would actually use none of them ('I doubt he'll be there').
I chose "whether" so I could post a comment, but I would say: I doubt he'll be there.