On passive verbs in queries

The Successful Queries database helps writers answer a number of questions. Some take little effort to answer. Others have taken me two weeks to answer, such as:

How many passive verbs does the average successful query use?

The answer, after reading 426 full queries:

1.092.

Of those 426 queries, 166 used zero passive verbs, 139 used only one, 74 used two, 22 used three, 14 used four, 10 used five, and one used six.

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