Он умолял доктора, лишь бы выздороветь.

Questions & Answers about Он умолял доктора, лишь бы выздороветь.

Why is выздороветь in the infinitive here instead of the past tense?
While бы usually pairs with a past tense verb to show a desire or hypothetical situation (like лишь бы он выздоровел - if only he would recover), we use the infinitive when the subject of both actions is the same person. Since 'he' is both the one begging and the one recovering, лишь бы + infinitive is used to mean 'just to recover' or 'as long as he could recover'.
Could we use чтобы instead of лишь бы here? How would the meaning change?
Yes, you could say чтобы выздороветь (in order to recover). However, using the particle лишь бы (if only / as long as) adds a strong sense of desperation and singular focus. It implies he didn't care about anything else—the cost, the pain, or the treatment—'as long as' he could get well.
Why is выздороветь perfective here, while умолял is imperfective?
Умолял (begged) is imperfective because it describes an ongoing, extended action in the past. Выздороветь (to recover) is perfective because it refers to the desired final result—a single, completed change of state from being sick to being healthy.
Why is доктора used here instead of the Dative case доктору?
Because of English, you might want to use the Dative case to mean begging 'to' someone. However, the Russian verb умолять (to beg or implore) requires its object to be in the Accusative case. Since доктор is an animate masculine noun, its Accusative form is доктора.

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