Peaceblinkfriend  +  572714 Fri, 03 Oct 08 09:19 AM Hi all,  Based on the data, the astronomers learned that the two planets have intersecting orbits. Basing on the data, the astronomers learned that the two planets have intersecting orbits. How does the second sentence differ from the first? I mean I think the second sentence reads a bit weird but I don't know if it is incorrect.  Thanks PBF Peaceblinkfriend Joined on Wed, May 9 2007 Senior Member 2,130 Success - it is not the position where you are standing, but which direction you are going.

	Mister Micawber  +  572755 Fri, 03 Oct 08 12:40 PM . Neither is right.  The understood subject of the nonfinite clause must be the same as for the main clause, but you don't supply enough text to make that clear.  Do something like this: Based on the data, their calculations demonstrated to the astronomers that the two planets have intersecting orbits. Basing their calculations on the data, the astronomers learned that the two planets have intersecting orbits. . Mister Micawber Joined on Wed, Aug 4 2004 Yokohama Veteran Member 30,471 'The question is,' said Humpty Dumpty, 'which is to be master-- that's all.' Clauses