Incorrect lemmatization of word "using" (lemmatizes as "used")

[beowulfenator]

The word "using" is lemmatized incorrectly:

import pattern.en

print("using", pattern.en.lemma("using"))
print("use", pattern.en.lemma("use"))

The result is:

using used
use use

For comparison, both amusing and amuse return the same lemma amuse.

This issue, in turn, breaks conjugation, so that conjugate("using", "1sg") returns used.

[lazyprgmr]

Hi I would like to work on this issue

[david02871]

conjugate("uses", "pl") also returns 'used' which is past tense and should instead be the result of conjugate("uses", "ppl")