In Present perfect^x, Subjunctives^x, Dates^x

Very carefully! And very sparingly!Provided the semantics allow it, the syntax is the same as for the present subjunctive of have, plus the past participle. The present subjunctive, if not the present indicative, usually substitutes, as the subjunctive form sounds too "fussy" to many...

Hi Bokeh, Becasue of your reply, it made me take a second look at the original question. I also did some research and found this paper written on the subject of Semantic Composition of Subjunctive Conditionals by Michela Ippolito of MIT/Tübingen University. I am not completely sure if I...