@Tex2002ans: It's very easy to check for specific issues with the command line version of LanguageTool.
For example if you saved your test file as tex.text, you'd use the following command line to only look for agreement issues:
java -jar languagetool-commandline.jar --language en-US --enabledonly --enable AGREEMENT_SENT_START tex.txt
Code:
Working on tex.txt...
1.) Line 1, column 32, Rule ID: AGREEMENT_SENT_START[5]
Message: You should probably use: 'are'.
Suggestion: are
This is the 1st erro. My names is tex. second, this is a diferent error. And t...
^^
Of course, you could also simply use LibreOffice and select the desired rules in the GUI.
Shameless plug: Sigil users could also use my
LanguageTool Sigil plugin, which also allows you to enable or disable specific rules.