3.went...had gone 4.went....had found....had lost 5.got....told....had cooked
6.returned....had already built 7.arrived....had already started 8.said....had done...went
9.began...had reviewed 10.made....had read
-> before/by the time+S1+Ved/c2,S2+had+Ved/c3
->after+S1+had +Ved/c3,S2+Ved/c2