(Kuno and Takami, 2002 with changes) However, the restriction can still be defended if the verb is variable in such a way that it is unaccusative in (10)a but unergative in (10)b, as in (9).
for (10)b to be true counterevidence, it must be demonstrated that the verb is unaccusative in its behavior in the syntactic context of (10)b.