I put 'He sees her?' and it was wrong. Surely this is the same as 'Does he see her?'
I would think so, but sometimes Duo doesn't capture all the quick ways of saying something in English. You should suggest it to them as an acceptable solution.
In written text, "He sees her?" is not a valid English sentence. It is merely casual spoken English that approximates the grammatically correct sentence "Does he see her?"
I put "He sees her?" and it was correct.
Does this sentence also translate to "Does she see him?" or is it only as above because 'er' is right after the verb?
No. It could be 'Does he see her?' however. 'Does she see him' would translate to 'Sieht sie ihn?'
Why would it not be "Does he see you?" ?
in the case ´Sie´ as formal you, the S must be in capital letter. Thus in this case, it must not be ´you´
Ah! I understand now. Thank you!
How about "Does it see her?"
'er' is german 'he', while german he is 'es'. If I want to say "Does it see her?", that should be "Sieht es sie?", instead of using 'er'.
I never know if they're saying "er" or "ihr"
"ihr" wouldn't make a correct sentence, unless it is "Seht ihr sie" (Do you see her).
Would it be wrong to say "Er sieht sie?"
No,it's all right. It would be equivalent to 'He sees her?'.
Why not 'did he see her?'
past tense would be 'Sah er sie?'
why not "Sieht er ihr?"