Word grammar checking options An example follows. A dog jumped over the cat. Another dog jumped over another cat. Yet, still a dog jumped over both cats. This paragraph shows how Word identifies the use of single spacing between sentences, when two are required. See the options below for grammar checking. (Note that grammar check may take some time to identify these issues since it is working in the background. Further, note that other errors may mask the detection of this error. If you purposefully leave it incorrect, Word will accept that and not identify it again until you reset grammar check by clicking the “Recheck Document” button.)