Breakdown of Собеседник молчит. Нам нечего обсудить, и мне нечего добавить.
и
and
мне
to me
нам
to us
молчать
to be silent
Questions & Answers about Собеседник молчит. Нам нечего обсудить, и мне нечего добавить.
Why does the sentence use the dative pronouns нам and мне instead of мы and я?
This is the standard structure for the predicative negative pronoun нечего (there is nothing). In Russian, when you want to say that someone has nothing to do, that person is put in the dative case (нам, мне), followed by нечего and the infinitive verb (обсудить, добавить). You can think of it literally as 'To us, there is nothing to discuss.'
Could I use ничего instead of нечего in this sentence?
No, because they serve different grammatical roles and are pronounced differently. нечего (which is always stressed on the first syllable) means 'there is nothing to [do]' and acts as the main predicate of a subjectless sentence. ничего (stressed on the last syllable) just means the noun 'nothing' and requires a normal subject and a negated verb, like in the sentence мы ничего не обсуждаем (we are discussing nothing).
How is the word собеседник formed?
It is a very common and useful word built from the prefix со- (meaning 'co-' or 'together'), the root бесед- from беседа (meaning 'conversation'), and the suffix -ник (indicating a person). So it literally means a 'co-converser', or simply the person you are currently talking to.
Why are the verbs обсудить and добавить in the perfective aspect here?