Breakdown of Ты можешь заменить консультанта завтра?
ты
you (singular)
завтра
tomorrow
мочь
to be able to
консультант
consultant
заменить
to substitute (pf)
Questions & Answers about Ты можешь заменить консультанта завтра?
Why does the word for consultant end in -а here?
The word консультант is the direct object of the verb заменить (to replace), so it needs to be in the Accusative case. Because a consultant is a living person (an animate masculine noun), its Accusative form matches the Genitive form, taking the -а ending.
How would I change this sentence to ask 'Can you substitute as a consultant tomorrow?' using this lesson's grammar?
You could say Ты можешь заменить в качестве консультанта завтра? or Ты можешь заменить как консультант завтра?. After в качестве, you must use the Genitive case (консультанта). However, как requires case agreement. Since you (ты) are the one acting as the consultant, как консультант stays in the Nominative case to match the subject.
Why use the perfective verb заменить instead of the imperfective заменять?
You are asking about a single, specific, one-time action (replacing the consultant just for tomorrow). If you were asking if the person could substitute on a regular or ongoing basis, you would use the imperfective verb заменять.
Can I move завтра to the beginning of the sentence?
Yes, Russian word order is very flexible. You can absolutely say Завтра ты можешь заменить консультанта? This simply shifts a slight emphasis onto the word tomorrow, but the core meaning remains exactly the same.
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