Review of the article "The Modification and Extension of the Equivalence Principle" submitted to the ScienceOpen Preprints for open peer review

1. The authors presented a well-organized paper that was easy to read and follow.

2. In this paper, the authors have analyzed the strong equivalence principle by the gravitational mechanism of etheric pressure.

3. The authors have shown that an object at rest in a uniform gravitational field of a specific strength is equivalent to moving in a straight line in a uniform etheric space with a certain speed.

4. The authors have also shown that the gravitational force received by an object at rest in a gravitational field with a field gradient is equivalent to the inertial force the object gets in a linear acceleration motion in ether.

5. The authors have concluded that the ether field with field gradient produced by a fluid whose velocity decreases in the direction perpendicular to the motion is equivalent to the gravitational field with field gradient.

6. There is a clear methodology. There is an extensive explanation of the method and a discussion of the results.

However, I suggest the authors consider the following issues.

1. The abstract is relatively long. I suggest the authors present shorter abstract of the revised copy of the manuscript.

2. The language of the article has to be slightly revised. The attached file includes many suggestions and comments on the first two pages of the manuscript.

3. The list of references is relatively short. I suggest the authors enhance the introduction of the manuscript to cover more related work in the literature.