Construct a sentence in Turkish using the postposition 'için' (for) and the pronoun 'biz' (we) in a way that requires the dative case on 'biz'.

The postposition 'için' (for) typically takes a noun or pronoun in the genitive case when indicating a beneficiary (e.g., 'bizim için' - for us) or follows an infinitive to express purpose (e.g., 'gitmek için' - in order to go). However, to construct a sentence using 'için' and the pronoun 'biz' (we) in a way that *requires* 'biz' to be in the dative case, we must form a sentence where 'biz' acts as a dative-marked element for a verb, and 'için' concurrently defines the purpose or reason for that specific action. This means the dative on 'biz' is necessitated by a verb, and 'için' then explains the context or purpose of that verb's action involving 'biz'.

Here is a sentence that fulfills this requirement:
"Müdür, bize yeni bir proje başlatmak için yetki verdi."

Let's meticulously break down this sentence to understand each component and its role:

* Müdür: This is the subject of the sentence, meaning "Manager".
* bize: This is the dative case form of the Turkish pronoun 'biz' (we). The dative case in Turkish is formed by adding the suffix '-(y)e' or '-(y)a' to a noun or pronoun, depending on vowel harmony. For 'biz', it becomes 'bize'. The dative case often indicates the recipient, target, or destination of an action. In this sentence, 'bize' functions as the indirect object, indicating *to whom* the action of giving authority is directed.
* yeni bir proje başlatmak: This is an infinitive phrase, meaning "to start a new project". An infinitive is the base form of a verb, typically ending in '-mak' or '-mek' (like 'başlatmak' - to start), and here it is used to describe an action.
* için: This is the postposition, meaning "in order to" or "for the purpose of". When 'için' follows an infinitive phrase, as it does here with 'yeni bir proje başlatmak için', it forms a purpose clause, explaining the reason or aim behind the main action of the sentence.
* yetki verdi: This is the verb phrase of the sentence, meaning "gave authority". The verb 'vermek' (to give) inherently requires its recipient (the entity to whom something is given) to be in the dative case. 'Yetki vermek' means "to give authority" or "to authorize".

In this construction, 'bize' is in the dative case because it is the specific recipient of the authority being given by the manager. The manager gave the authority *to us*. The purpose clause, 'yeni bir proje başlatmak için' (in order to start a new project), directly specifies the *reason* for which this authority was conferred upon us. Therefore, while 'için' itself does not directly apply the dative case to 'biz', the overall sentence structure utilizes 'için' to define the purpose of an action ('yetki verdi') where 'biz' is grammatically required to be in the dative case as the recipient of that action. This specific interplay fulfills the condition of requiring the dative case on 'biz' within a construction that employs 'için'.