Breakdown of Чтобы пройти трассу, нужно безопасно перейти мост.
нужно
it is necessary
мост
bridge
перейти
to cross
чтобы
in order to
трасса
route (highway, track)
пройти
to pass (perfective)
безопасно
safely
Questions & Answers about Чтобы пройти трассу, нужно безопасно перейти мост.
What is the exact difference between пройти and перейти in this sentence?
Both are perfective verbs of motion on foot, but their prefixes give them different paths. The prefix про- in пройти means to cover a distance or pass through something from start to finish, which makes sense for completing a route (трассу). The prefix пере- in перейти means to cross over something from one side to another, which is exactly what you do with a bridge (мост).
Why are пройти and перейти in the perfective aspect here, instead of проходить and переходить?
They are perfective because the sentence focuses on successfully completing these actions to achieve a specific result: finishing the route and getting across the bridge. If you were talking about the general process of crossing, or crossing bridges repeatedly as a habit, you would use the imperfective forms проходить and переходить.
Why does чтобы take the infinitive verb пройти right after it?
The word чтобы means "in order to" here. When you want to say "in order to do something" and the subject is the same for the whole sentence (or, in this case, it's a general impersonal rule using нужно), you simply follow чтобы with the infinitive form of the verb.
Both the route and the bridge are direct objects. Why does трасса change to трассу, but мост doesn't change?
They are both in the accusative case because they receive the action of the verbs. Трасса (route) is a feminine noun, and feminine nouns ending in -а change to -у in the accusative case. Мост (bridge) is a masculine inanimate noun (it is an object, not a person or animal). For masculine inanimate nouns, the accusative case looks exactly the same as the dictionary form.
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