[Grammar] congruous

[solangej]

Hi, I teach English to Dutch pupils and I can't find the correct translation of the Durch word "congruentie" which means (in Dutch) that if your subject is singular your verb has to be singular too. I've found translations like : congruousness, matching,..but as I'm not a native speaker, I don't know which one is best. Can you help?

[David L.]

subject-verb agreement