This is the 2965th most frequent Dutch word.
beloven
To promise.
Here, 'beloven' (to promise) is used in its present tense form 'beloof' to indicate a promise being made in the current moment.
Ik beloof je dat ik morgen op tijd zal zijn.
I promise you that I will be on time tomorrow.
The verb 'beloven' is used in the past tense 'heeft beloofd' to indicate an action of promising that occurred in the past, with the infinitive 'om (...) af te maken' specifying what was promised.
Hij heeft beloofd om zijn huiswerk af te maken.
He has promised to complete his homework.
The verb 'beloven' is in the future tense 'zullen beloven', showing that the action of promising will take place in the future, with 'geheim te houden' indicating the object of the promise.