The predicate knowledge corresponds to the subject I, the predicate corresponds to the subject who (who is co-parent with my mother, and therefore the third person singular) and that the predicate likes with the subject of my mother, who has four brothers and sisters, which is the third person singular. Example (3) shows that a verb sentence composed of a combination of a finite verb and an unfinished verb is always finite. Rule 5a. Sometimes the subject is separated from the verb by words like with, as well as, next to it, not, etc. These words and phrases are not part of the topic. Ignore them and use a singular if the subject is singular. If you are looking for an exception to the statement that subject-verb concordance has no influence on interpretation, try using a plural zero subject, for example. B sheep. This rule can lead to bumps in the road.