For at or til at 2
For at means in order to. It is the answer to the question why? The focus is on the motive behind the action:
Han tog kniven frem for at skære sig et stykke brød (He took out the knife in order to cut himself a slice og bread)
Til at means meant for. It is the answer to the question: For what purpose? The focus is on the tool or ressource.
Han købte en kniv til at skære brød med. (He bought a knife for cutting bread)
For at kunne means in order to be able to and comes close to the meaning of til at. But still it's a question of motive.
Han købte en kniv for at kunne skære brød, hvis han fik lyst. (He bought a knife in order to be able to cut himself a slice of bread if he felt like)
Choose for at, for at kunne or til at in the drop-down list