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Rule "Agreement: Mass/singular noun + non-third-person verb"

This is one of many errors that LanguageTool can detect.

Description: Agreement: Mass/singular noun + non-third-person verb
Message: Possible agreement error - use third-person verb forms for singular and mass nouns.
Category: Grammar (ID: GRAMMAR)
Incorrect sentences
that this rule can detect:
  • She wants to know whether this room are big enough.
    Correction suggestion: is
  • She wants to know whether your room are big enough.
    Correction suggestion: is
Correct sentences
for comparison:
  • She wants to know whether this room is big enough.
  • So I said what the heck try a new battery in the tilt sensor.
  • When the interface clock period is shorter than the largest time difference between signal arrivals, recovery of the transmitted word is no longer possible.
ID: MASS_AGREEMENT [9]
Version: 6.8-SNAPSHOT (2025-11-03 22:33:08 +0100)