Breakdown of Ради безопасности я должен убедить смотрителя.
я
I
должен
must, have to (должен, должна, должны)
убедить
to convince (perfective)
ради
for the sake of
безопасность
safety, security
смотритель
keeper
Questions & Answers about Ради безопасности я должен убедить смотрителя.
The lesson is about defective verbs. Since убедить is one of them, how would I say "I will convince the keeper" without using должен?
Убедить lacks a first-person singular future form. Words like убежу or убеждю do not exist in standard Russian. To say "I will convince", you must use a workaround like я смогу убедить (I will be able to convince) or я постараюсь убедить (I will try to convince). In our sentence, using the infinitive after должен neatly avoids the missing form altogether!
Why use ради here instead of для?
While для broadly means "for" (indicating destination or general purpose), ради specifically means "for the sake of" or "in the name of." Using ради безопасности emphasizes that safety is the driving motivation or higher purpose behind the action. Like для, ради takes the Genitive case.
Why does смотрителя look like it is in the Genitive case if it is the direct object of the verb?
It is actually in the Accusative case! Because смотритель (keeper or warden) is a masculine animate noun, its Accusative form mirrors its Genitive form. Thus, the soft sign at the end of the nominative form changes to -я.
Could I use the imperfective verb убеждать after должен in this sentence?
You could, but it changes the meaning. The perfective убедить means you must achieve the result: successfully change the keeper's mind. If you used the imperfective убеждать, it would mean you must engage in the process of arguing or trying to convince him, without guaranteeing you will succeed.
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