Hi,
I couldn't hear what she was __ .
a) telling b) saying c) talking d) speaking
Can anyone tell me how to explain why a, c and d are the wrong choices in this particular case?
The idea here is that I couldn't hear the vocal sounds she was making.
'Telling' focuses on information and not on sounds.
'What' is the object of the missing verb, so the missing verb has to be a verb that can take an object. 'Talking' and 'speaking' don't normally take an object, ie you can't usually 'talk something' or 'speak something'. There are some special cases, eg you can speak English, but the name of a language doesn't seem to fit well in your example.
Best wishes, Clive