answer for
1.对…负责 :I'll answer for your safety.我会对你的安全负责.
2.保证（某事）良好
I will answer for the truth of what he has said.
我保证他所说的话是真的.
provide for
v.
作准备,供养,规定
Let's provide for the entertainment of our guests.让我们为招待客人做准备吧.
He provides food and clothes for me.他为我供应衣食.