I'm new here. Can you please let me know how I may set a rule to point the error in 'When I meet him yesterday, he is happy'?
Hi, thanks for your interest in LanguageTool. Here is our documentation about how to write rules: http://wiki.languagetool.org/development-overview. One could write a simple rule that matches "meet ... yesterday", but that would cause false alarms (e.g. "I was supposed to meet him yesterday"), so some trial and error will probably be needed.