As a native English speaker, "We go to the boy" seems like odd phrasing for something habitual because a boy isn't a location, a boy can move around. Since learning chodzimy versus idzimy seems to be confusing, it would be nice if the examples were more clear. I think this might be why the school examples can also be confusing: school can be a physical destination or represent an ongoing process of education.
Most of the iść/chodzić examples aren't that great. Those verbs are very basic ones given their meaning, but they are also difficult and I don't think they should've been introduced that early in the course.
Anyway, as we can't do much about it now (and already have done a lot about it in the new tree version we're working on), I'd just think about this sentence here as 'the boy's house' :)
Idę means that the action is happening right now and it has a defined direction.
Chodzę means that the action is repeating or has no defined direction.
Since I see you took Russian, it's the same there.
"My idziemy do chłopca" means that the action is happening right now, so "we are walking to the boy".
It's a similar case with many other motion verbs.
Because Duolingo is a language-teaching website, not a phrasebook. You might not need the phrase "we go to the boy" any time soon, but it's good practice for the verb to go, the word "boy", the word "we", the difference between habitual and continual verbs in Polish, etc etc.
In Polish there are several verbs (of motion), which can have either determinate or indeterminate forms.
Chodzić is indeterminate, which means that it can be:
- 1) habitual (to walk regularly)
- 2) progressive, but non-directional (to be walking around)
Since "we are walking to the boy" is neither of those (it's both progressive and directional), it can only be translated by the determinate counterpart of chodzić, which is iść. But the original sentence uses chodzić here.
Btw, same goes for jeździć/jechać, nosić/nieść, biegać/biec, latać/lecieć, pływać/płynąć, wozić/wieźć. (Determinate forms in bold letters)