Breakdown of Сначала надо постучать, а потом войти.
а
and (contrastive)
сначала
first
потом
then
надо
must, need to
постучать
to knock (pf)
войти
to enter (pf)
Questions & Answers about Сначала надо постучать, а потом войти.
Why do we use войти here instead of входить?
Both mean 'to enter', but войти is perfective and входить is imperfective. Since the sentence describes a sequence of single, completed steps (knock, then enter), we need the perfective form. You would use входить for repeated actions, like entering a room every day.
How exactly is the word войти built from its root?
It is built from the prefix в- (in/into) and a form of the verb идти (to go on foot). When a prefix is added to идти to make a perfective verb, the root changes to -йти. Because в- is a consonant, Russian adds an о to make it easier to pronounce, giving us во- plus -йти.
Why does the sentence use а instead of и for the word 'and'?
In English we say 'and then', but Russian frequently uses а to connect сначала (first) and потом (then). In this structure, а emphasizes the transition between the first phase of the plan and the second phase, rather than just lumping them together with и.
Who is doing the knocking and entering, and why are the verbs in the infinitive?
This is a general statement, so there is no specific subject like 'I' or 'you'. It uses the impersonal word надо (it is necessary / one must). Whenever you use надо to express a general rule or need, you simply follow it with verbs in their dictionary (infinitive) form, which are постучать and войти here.
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