Which one is correct?
"which we have used to" or "which we have use to"?

Question

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Some examples from the web:

Cynthia Stifter and I are continuing this work with a special emphasis on hidden Markov modeling which we have used to model mother-infant interactions.
This is the 'master' which we have used to guide our own reproduction. The full production process is being documented in an extended series of videos, but this ...
This DOM model is, in turn, being used as the basis for our Hg mass balance model which we have used to develop relationships between Hg flux and ...
... fabricators and consultants around the world, which we have used to refine our algorithms, user interface and program design. The result is a powerful and ...

Some examples from the web:

Aug 2, 2011 ... We can use the same PFX certificate which we have use to sign XAP file in " Specify a certificate" section (Part 2). Because above option 1 is ...
Dear friends this gigs are the most wanted gigs on fiverr which we have use to make lots of dollars on fiverr. These 8 gigs will keep you busy ...
Therefore, in this paper, we present a general statistical image modeling framework which we have use to build prior models of the sky and ground. Once trained ...
The LC display standard for the transparent conductor is indium tin oxide. (ITO), which we have use to construct many functional prototypes (see, for example.

A complete search of the internet has found that "which we have used to" is the most popular phrase on the web.

Last Updated: November 13, 2015