(1) David and I wanted go off to find help but Bill insisted on staying near the car. (wanted 后加 to,因为want 后要接不定式) (全国卷)
(2) …rather than go into the forest and getting lost. (getting 改 get,因为 get 与其前的go 并列) (全国卷)
(3) David pointed to a path which he thought would probably leading to a village. (leading 改为 lead,因为其前有助动词 would) (全国卷)
(4) I went back to get David and helped him to stood up. (stood 改为 stand,因为 to stand up 在此为不定式结构) (全国卷)