Both in English indicates two out of a group of two. Either indicates one out of a group of two. Neither indicates zero out of a group of two.
To use the modal verb 'must' when you talk about the past.
When do you use mich vs mir? Also why is it "Mir ist kalt" instead of "Ich bin kalt"?
Generating questions for collocations
What does "before it fades to black" mean?
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