I often hear these mistakes made by German speakers who are learning English.
They say: The manager is responsible to make the decision.
There is a preposition missing in this sentence. Remember we say ‘responsible for’ something or someone.
Also, responsible for takes the _ing form if followed by a verb.
So the correction is: The manager is responsible for making the decision.
Some further examples:
She is responsible for placing the order.
They are responsible for planning the event.
I am responsible for organising the meeting.
Have fun learning English!
Louise