【正文】
the ing participle should occur in the passive, eg: ? The problem being discussed is of vital importance. ? I object to being kept waiting. ? The logical subject of the passive ing participle need not be expressed if it is the subject of the main clause as shown in the above examples, and must be expressed if the passive ing participle does not share the subject with the main clause, eg: ? The workers were proud of their products being praised highly by the buying public. ? When a passive ing participle with a persional pronoun as its own subject functions as the object or prepositional plementation, the personal pronoun can occur either in the objective or in the genitive case, ie, in the form of a possessive determiner, eg: ? I insisted on him/his being invited. ?Contrast between passive infinitive and passive ing participle. ? Both the passive infinitive and the passive ing participle can function as the object of transitive verbs. It must be noted that some verbs can only collocate with the infinitive, some only with the ing participle, and some either with the infinitive or with the ing participle without change of meaning except for a few cases where there is difference semantically. Compare: ? He wants to be invited. ? He enjoys being flattered. ? He likes to be consulted/being consulted. ? He fot to be photographed=He fot that he had to be photographed. ? He fot being photographed=He fot that he had been photographed. ? If a passive nonfinite verb functions as prepositional plementation or as object of a phrasal verb, it can only be an ing form.