Learn Turkish: Duvarı matkapla öyle delme. - Don't drill the wall like that with the drill.

In Turkish, böyle means "like this" (referring to something close to the speaker), while öyle means "like that" (referring to an action the listener is doing or something further away). Since the speaker is telling the listener to change the way they are currently drilling, öyle is the natural choice.

Why is it duvarı instead of just duvar?

The -ı is the accusative case suffix. It marks duvar (wall) as a specific direct object. The speaker is saying "don't drill the wall" rather than making a general statement about "drilling walls".

How is the word matkapla formed to mean "with the drill"?

The root word is matkap (drill). To say "with", Turkish adds the instrumental suffix -(y)la/-(y)le, which is the shortened, attached form of the word ile. Following A-type vowel harmony, it attaches to the hard consonant as -la, creating matkapla.

Can delme also mean the noun "drilling"? How do we know it's a command here?

Yes, the -me/-ma suffix is used to make both verbal nouns (like "drilling") and negative commands. You can tell it's a command here because it sits at the very end of the sentence acting as the main verb, translating directly to the order "don't drill!"