Breakdown of Он работает осторожно.
он
he / it (for a masculine noun) / it (for a neuter noun)
работать
to work
осторожно
cautiously, with care
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Questions & Answers about Он работает осторожно.
Why does the word осторожно end in -о?
How would I ask a question to get this exact sentence as an answer?
You would use the question word как (how). The question would be Как он работает? (How does he work?).
Could I change the word order and say Он осторожно работает?
Yes, Russian word order is very flexible. However, placing the adverb at the end like in Он работает осторожно puts the most important new information at the end of the sentence, emphasizing exactly how he works.
Why does the verb работает end in -ет here?
Because the subject is он (he). The verb работать (to work) is a regular verb. To match he, she, or it, we drop the -ть from the dictionary form and add the ending -ет.