The general technique is to demote A to IO which is echoed in the verb wioth the help of 'dative1'-clitics. They were afraid of going home'. Participles can occour both in attributive function or as non-finite forms in subordination. In fact, participles in soibordination share a number of properties with non-finite verbs in serialized sequences. It is important to note that the case of a referent is determined by the valence of the first verb in such a serialized sequence, cp.
Participles normally maintain their verbal valence even if they are nominalized, cp.
There he stayed till Herode was dead'. In such constructions, coreference is preferred. Preverbs that once must have played a major role in this context have nowadays become strongly fossilized. It always calls for a AGR-clitic to follow it. I did not catch THIS FISH'.