Breakdown of С помощью лазера мы можем фокусировать оптический сигнал.
мы
we
мочь
to be able to
сигнал
the signal
с помощью
with the help of
лазер
the laser
фокусировать
to focus (optics, camera, attention)
оптический
optical
Questions & Answers about С помощью лазера мы можем фокусировать оптический сигнал.
Why do we use с помощью here instead of just the instrumental case (лазером)?
While you could say лазером (by means of a laser), using the compound preposition с помощью (with the help of / using) sounds a bit more formal, precise, or technical. Both are correct, but с помощью is very common in scientific or instructional contexts. Notice that it forces the following noun into the Genitive case (лазера).
Could I use при помощи or посредством in this sentence instead?
Yes, при помощи лазера means exactly the same thing and is equally common. Посредством лазера (by means of a laser) also works and takes the Genitive, but it sounds even more formal and bookish than с помощью.
Why is the verb фокусировать used here instead of the perfective form сфокусировать?
The sentence describes a general capability or a repeated action (we can focus signals in general), which is why the imperfective фокусировать is used. If we were talking about successfully focusing a specific signal on one particular occasion, you would use the perfective сфокусировать.
Why doesn't оптический сигнал change its ending if it is the direct object?
It actually is in the Accusative case because it is the direct object of the verb. However, because сигнал is a masculine, inanimate noun, its Accusative form is identical to its Nominative (dictionary) form. The adjective оптический follows the exact same rule.
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