How can you tell the tense in this sentence? For example how would you say did you see the mice.
You can tell the tense by taking a look at the verb: zien is both the infinitive form and the plural form for the present tense. In this case, as jullie is in the sentence, it's clear that it's in the present tense.
The past of zien is zag(en) (zagen jullie de muizen?).
Dan's version (hebben jullie de muizen gezien? - similar to the English Present Perfect, although its use doesn't coincide with the way in which we use it in English) also has past time reference.
I don't understand why in previous translation of "Horen Jullie de kip?" my traduction ""do you hear the chicken?" was corrected into "You hear the chicken?" and invalidated. Now, if I write "You see the mice?" AI corrects it with "Do you see the mice?". Which one should be considered "correct" and, is there an AI issue, maybe?
Both are correct, but the structure with "do" is more commonly used/taught. I think Duolingo should leave out sentences like "you hear the chicken" because they are unnecessarily confusing.
You can use can if a form of kunnen is used in the Dutch sentence.
These verbs (can and kunnen) are used in combination with other verbs to denote general ability or permission to do something. So in a way, it has a reference to the present.
I don't really understand your question regarding tense, since you didn't provide any examples, but I'll take the liberty to assume that you were referring to the use of have as an auxiliary.
In such a case, the tense that is formed is the Present Perfect, but note that (despite its name) it actually refers to the past.
You can use it if you want to talk about an event that took place at an unspecified time in the past (or if -when translating- in the Dutch sentence you have a form of hebben+past participle).
Mmm, not really, since using the Present Continuous with the verb see normally implies a change in meaning (if you are seeing someone, you're dating her/him, or depending on the context, it could mean you have plans to meet her/him... But in the last case, you'd need a time marker, like 'tomorrow', 'next weekend', etc.).
For more information, search for 'stative verbs' on the internet. Here's a Wikipedia article on this matter: https://en.m.wikipedia.org/wiki/Stative_verb
No, that would be zagen jullie de muizen? (or zag je de muizen? if 'you' refers to just one person) or hebben jullie de muizen gezien? (*heb je de muizen gezien? -2nd person singular).