In ordinary speech, we often end sentences with prepositions (e. g. in, from, with, for, to), for example:
In academic writing, though not a terrible sin, overuse of the dangling preposition makes many markers wince. Luckily, it is very easy to avoid danglers through a simple rearrangement of words. In the examples above, it is neater to write:
This formula, i.e. changing things round so that the preposition no longer comes at the end, works well for most danglers.
Tip: be reasonable. Don’t go mad and write ‘up with which we will not put’ instead of ‘we will not put up with’ or 'the information of which we got hold' instead of 'the information we got hold of'. Sometimes danglers are perfectly acceptable. It’s when they appear at the end of almost every sentence that they can infuriate.