(e) The frog is hopping from one rock to another. (f) to, over , and from work, but I don't thnk on works very well. The use of the present continuous seems strange, but there is nothing really wrong with it.
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Vincent TeoThanks. How about (a_ , (b) , (C), and (d)? Are there all correct?For the sake of time, if I comment on some but not on the others, you can assume that the others are correct (with the possible exception of the use of the present continuous, which I mentioned).