Looking on the internet deeply has found these results:

She does not know how to respond back at the teachers. is the most popular phrase on the web.

She does not know how to respond back to the teachers. 1393,000,000 results on the web	She does not know how to respond back at the teachers. 1453,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
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She does not know how to respond back to the teachers.

1393,000,000 results on the web

She does not know how to respond back at the teachers.

1453,000,000 results on the web

More popular!

And to be honest... we don't know how to respond to that one.
Great, I really don't know how to respond to that where I come out looking like a good guy.
She does not know how to exhibit the dress properly.
And I didn't know how to respond.
Your muscles know how to respond.
I don't know how to respond to that.
I don't... really know how to respond to that.
Employees interacting directly with players should be trained to ensure they understand problem gambling issues and know how to respond to them.

I don't... really know how to respond to that.
She does not know how to exhibit the dress properly.
Great, I really don't know how to respond to that where I come out looking like a good guy.
I don't know how to respond to that.
Your muscles know how to respond.
Employees interacting directly with players should be trained to ensure they understand problem gambling issues and know how to respond to them.
And I didn't know how to respond.
And to be honest... we don't know how to respond to that one.