Hello!
This is the rule:
<!-- English rule, 2015-09-12 -->
<rule id="ID" name="Third person singular">
<pattern>
<token>software</token>
<token>have</token>
</pattern>
<message>Use <suggestion>has</suggestion> with third person singular</message>
<example correction=''>This <marker>software have</marker> been modified.</example>
<example>This software has been modified.</example>
</rule>