Questions & Answers about Samochód nie może wjechać do tego lasu.
What is the difference between jechać and wjechać here?
Jechać is the basic, ongoing action of driving. By adding the prefix w-, we get wjechać, a perfective verb that specifically means "to drive into" and focuses on the completed result of entering. It is almost always paired with the preposition do.
Why is it tego lasu instead of ten las?
The preposition do always forces the following words into the Genitive case. Tego lasu is the Genitive form of ten las (this forest). The noun las takes an -u ending here, which is very common for masculine inanimate nouns in the Genitive.
Since the sentence has nie, does the negation rule affect the case of the forest?
Good catch, but no! It is true that negating a sentence usually changes a direct object from the Accusative case to the Genitive case. However, prepositions are stronger than this rule. The word do always takes the Genitive case, regardless of whether the sentence is positive or negative.
Why is wjechać left in its dictionary form instead of being conjugated?
It follows the conjugated modal verb może (from móc, meaning to be able to). When you use a helper verb like this, the main action verb stays in the infinitive, exactly like in English ("cannot drive").