Learn Hardcore Russian: Мой дедушка едет в парк.

In Russian, ехать (and its form едет) is used when someone is traveling by a vehicle, whereas идти is used for walking. The sentence implies that my grandfather is using some type of transport, so едет is the correct choice.

What role does the preposition в play in в парк, and why does the noun парк remain unchanged?

The preposition в indicates movement toward a destination and is typically followed by the accusative case. In this example, парк is a masculine noun whose accusative form is identical to its nominative form, which is why it appears unchanged.

How does the possessive pronoun Мой agree with the noun дедушка in this sentence?

In Russian, adjectives and possessive pronouns must agree with the noun they modify in gender, number, and case. Here, Мой is in the masculine singular nominative form, matching дедушка (a masculine singular noun), which means "grandfather."

What is the tense of едет, and what does it tell us about the timing of the action?

The form едет is the third-person singular present tense of the verb ехать. This indicates that the action is happening right now, meaning "my grandfather is currently on his way to the park."

How would you change the sentence if you wanted to express that my grandfather is walking to the park instead of riding?

To indicate that he is walking, you would replace едет with идёт (the third-person singular present tense of идти). The modified sentence would be: Мой дедушка идёт в парк. This clearly signals that he is going on foot.