Breakdown of Я сам всё сделал.
сделать
to do (perfective) / to make (perfective)
весь
all, the whole, everything, everyone
сам
oneself (emphatic: "I did it myself")
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Questions & Answers about Я сам всё сделал.
Why is "everything" translated as всё here instead of весь or все?
When used on its own as a pronoun meaning "everything," Russian uses the neuter singular form всё. Here it acts as the direct object of the verb, so it is in the Accusative case (which looks exactly the same as the Nominative всё). If you used the plural все, it would mean "everyone" instead.
How do we know the speaker of this sentence is male?
Could I change the word order and say "Я сделал всё сам"?
Yes, you absolutely can. Russian word order is very flexible. Putting сам at the very end places a slightly stronger emphasis on the fact that you did it by yourself without any help. The original sentence (Я сам всё сделал) is a very natural, everyday way to state the fact.
Why use the perfective verb сделал instead of the imperfective делал?
The perfective verb сделал focuses on the finished result: you successfully completed the task. If you used the imperfective делал, it would mean "I was doing everything" and focus more on the ongoing process rather than the completion.