There are five good reasons for using the passive, aside from those, using the active is by far the more preferable way of writing. There are some, though, who can’t seem to break the habit of overusing it. Surely, there has to be an element of changing the way you think, but there are practical things you can do until that change happens.
Happily, the practicalities of removing passive in your writing is pretty simple using functions in Word — maybe when you see where you use the passive, your thinking will start to change naturally.
How to find your passives
On your document, use CTRL+F to launch a ‘find’ facility. Type ‘by’ into the search area (why ‘by’? See here: grades are received by students, results are understood by reading the research thoroughly), which will help you find unnecessary passives that have the subject in the object position (everything after the ‘by’).
When you find that subject in the object position, you can easily restructure the sentence to put the subject in the active position (usually at the beginning of the sentence) and make the whole sentence active (e.g. students receive grades, reading the research helps us to understand the results).
You could also use the CTRL+F function to search for conjugations of ‘to be’ (is, are, should be, have been etc.), again, helping you to identify where you have used the passive forms and changing them to active.
And there you have it. Passives will be a thing of your past, unless you use them for a particular purpose.