@spearer: I understand your confusion, but the R is not supposed to be part of your mixup. It's just that the Dutch female voice in the course has a potato up her throat, so 'hert' sounds like 'hegt'. In reality, it does not. The rest of her pronunciation is excellent, but this is her weakness.
het hert is the Subject of this sentence, the Direct Object being Engels.
You'll argue that Engels is a specific DO, I can see it coming.... but no, sorry, it is not. You see, it is non-specific because you cannot place a definite article before it (think of it in English for a second: you can't say 'the English').
As there's no definite article preceding the noun, it's a non-specific DO.
Non-specific DOs are those that fulfil one of these conditions:
They are preceded by an indefinite article: een.
There's no definite article preceding the noun/noun phrase.
They are preceded by a cardinal number (twee, drie, etc.)
- They are preceded by an indefinite pronoun (geen, enige, enkele, wat, veel).
Hope this helps :)
Yes, this is natural in Dutch. "Geen" is used to negate nouns (specifically, nouns that are the objects of active verbs or subject complements of "to be", "seem" or "become"), similarly to "kein/keine" in German.
Some simple examples:
Ik drink geen thee (I do not/am not drinking tea). Here "thee" is the direct object of "drink", so you use "geen" to negate it.
Ik drink niet (I do not drink) - in this case, there is no object or subject complement. The verb is being negated, so you use "niet" in this case.
Ik ben geen meisje (I am not a girl). Here "meisje" is the subject complement of "ben" (first person singular verb form), so you need to use "geen" to negate it.
De appel is niet geel (The apple is not yellow). In this case, you have a predicate ADJECTIVE rather than a complement subject NOUN following "is", so here you would use "niet" to negate the adjective.
German has very similar rules with "kein/keine", so if you know German, that's a bit of an advantage. Both "kein" in German and "geen" in Dutch literally mean "not a", so that's why they negate nouns. (You couldn't say "The apple is not a yellow", but you can say, "He is not a girl"). Anyway, hope this helps to clear it up a bit.