Questions & Answers about Bebeğin uyuması gereken beşik çok güvenli.
Why do we use Bebeğin uyuması instead of a regular verb phrase?
This sentence uses a verbal noun to express necessity in a relative clause. Instead of treating sleep as a regular verb, we treat the action as a possessed noun phrase. Bebeğin takes the genitive case to act as the owner of the action, and uyuması takes the possessive suffix, literally translating to 'the baby's sleeping'.
How does gereken link the baby's sleeping to the crib?
Gereken is the subject relative participle of gerekmek (to be necessary). It acts as an adjective meaning 'which is necessary'. Put together, Bebeğin uyuması gereken beşik literally means 'the crib [for] which the baby's sleeping is necessary'.
The English translation says 'sleep in', but there is no locative suffix like -te on beşik. Why?
Turkish relative clauses do not leave trailing prepositions the way English does. When you modify a noun directly with a participle like gereken, the physical relationship (sleeping 'in' the crib) is naturally implied by the context. You do not need to force a spatial word or a locative case into the clause.
Why do we use the subject participle gereken instead of the object participle gerektiği?
The grammatical subject of the necessity is the entire action phrase: Bebeğin uyuması (the baby's sleeping). Because that subject phrase is what 'does' the verb gerekmek (the sleeping is what is necessary), we must use the -(y)An subject participle, making it gereken.