Question 1

Since исследовать is a biaspectual verb, how can we tell its aspect in this specific sentence?

Accepted Answer

Context is everything with biaspectual verbs! The form исследует can technically be present tense (imperfective: is researching) or simple future tense (perfective: will research / will have researched). Because the English translation describes an ongoing action (is researching), we resolve it as imperfective here.

Question 2

If I wanted to clearly say "The scientist WILL research the history", could I still use исследует?

Accepted Answer

Yes, you can! Because исследовать can act as a perfective verb, учёный исследует can also mean "the scientist will research" (perfective future) if the broader context implies a completed future action. However, to explicitly show an ongoing future action, you would use the compound imperfective future: будет исследовать.

Question 3

The word учёный translates to "scientist", but it has an adjective ending. How does it decline?

Accepted Answer

It declines exactly like a standard adjective, even though it functions as a noun. For example, if you wanted to say "I see the scientist," you would use the accusative animate form: Я вижу учёного. Words like this are called substantivized adjectives; this one literally means "a taught/learned person".

Question 4

Is города in the accusative case here along with историю?

Accepted Answer

No, города is in the genitive case, meaning "of the city". Only историю is in the accusative case because it is the direct object of the verb исследует. A common trap is wanting to make both nouns accusative, but the genitive noun attached to it (города) doesn't change its case just because the main noun (историю) changed.

Учёный исследует историю города.

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