to infer
inferred, inferring
infered, infering
to confer
confered, confering
conferred, conferring
to offer
offerred, offerring
offered, offering
to buffer
bufferred, bufferring
buffered, buffering
to refer
referred, referring
refered, refering
to prefer
prefered, prefering
preferred, preferring
to suffer
suffered, suffering
sufferred, sufferring
to transfer
transfered, transfering
transferred, transferring
to differ
differed, differing
differred, differring
to defer
deferred, deferring
defered, defering