4

The exclamation "Rather!", said with the accent on the second syllable, signifying enthusiastic agreement, is severely dated. It was briefly popular in the 1920s among the British (and, among them, mainly English) upper classes. It would be considered very old fashioned by many modern British speakers, and will be found mainly in the Wooster and Jeeves ...


2

For many people there's is an invariable form, irresepective of whether it is introducing a singular or plural noun phrase. There is is less common in this context, but you sometimes hear it. It is non-standard, but quite common.


1

That seems to be a "knock, knock" joke, one of a large class. The one you've quoted doesn't seem very funny, but maybe you haven't quoted the entire conversation. As Michael Harvey said in his comment, "There is two" is uneducated usage.


1

The most common usage is (c) but if the audience is all male or it's an archaic context, you will likely see (a).


1

Alan Bleasdale's emotive series "Boys from the black stuff" (1982) follows the unfortunate Jimmy (Yosser) Hughes as his life spirals downwards after he loses his job, working with a tarmac gang in Liverpool, to losing his wife and falling foul of the local authorities. Towards the end of the series Yosser, driven to despair, is seen begging for work with ...


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