kono kikai wa ondo o seigyoshimasu.

This machine controls the temperature.

Breakdown of kono kikai wa ondo o seigyoshimasu.

• は: topic particle
• を: direct object particle
• この: this
• 温度おんど: temperature

Questions & Answers about kono kikai wa ondo o seigyoshimasu.

Why is は used after 機械 here?

は marks 機械 as the topic of the sentence.

So この機械は means something like:

• as for this machine
• this machine, ...

In English, we often just say This machine controls the temperature, but Japanese often separates the topic from the rest of the sentence.

So the structure is:

• この機械は = as for this machine
• 温度を制御します = controls the temperature

Why is を used after 温度?

を marks the direct object of the verb — the thing being acted on.

Here, the verb is 制御します (to control), and the thing being controlled is 温度 (temperature).

So:

• 温度を = temperature + object marker
• 温度を制御します = controls the temperature

A good way to remember it is: the noun before を is usually what receives the action of the verb.

Why is the word order different from English?