The feature person applies to verbforms which have the vf-m-values ind, sub, impr and cond, and this for the specified tns-values. This feature doesn't apply to verbforms which have the vf-m-values inf, and part. Concerning the vf-m-value impr, only the p-values 1 and 2 apply. Notice that for imperative forms (vf-m-value impr), restrictions concerning the combination of p- and n-values exist: If the p-value is 1, the n-value must be p. The p-value 2 can be combined with the two n-values, s and p.
It can occur that for some defective verbs all p-values are not realized.