grammaticality - Is Many thanks a proper usage? - English Language . . . As Martha says, many thanks is perfectly idiomatic However, it is indeed an oddly isolated idiom: most other constructions which try to treat thanks as a plural noun are ungrammatical (eg *lots of thanks), and there’s certainly no such thing as *a thank
grammaticality - Whether or not vs. whether - English Language . . . It's worth pointing out that, etymologically speaking, the roots of whether are which either of two It's inherently a "binary choice" word, so whereas "I don't know whether it be fish or fowl" is fine, "I don't know whether it be fish or fowl or good red herring" isn't really grammatical