Our findings also suggest that transfer to the L3 is likely to occur from the L2 when the L2 and L3 are more similar overall, even if the particular morphosyntactic form in question is more similar to the L1 than the L2, which is only somewhat congruent with previous studies.
the fact that neither onset age nor years of studying the L3 were good predictors of L3 progressive marking indicates that transfer is the strongest influencer of L3 acquisition, which is congruent with the current body of L3 acquisition research.