Ik laat mijn broer mijn fiets gebruiken.
English: I let my brother use my bike.
In Dutch, 'laten' + infinitive is used to express that someone allows or causes another person to do something. It is similar to saying 'let' or 'have someone do something' in English.
You use 'laten' + infinitive when you want to say that you allow or make someone do something. It is also common when you ask someone to do something for you, or when you describe giving permission.
Ik laat mijn broer mijn fiets gebruiken.
English: I let my brother use my bike.
Zij laat haar kinderen buiten spelen.
English: She lets her children play outside.
Laat de hond binnen!
English: Let the dog in!
Wij laten de leraar het uitleggen.
English: We let the teacher explain it.