If the subject of the sentence is a number that relates to a unique amount of something, use a singular verb. When a sentence begins with there is/here, the subject and verb are reversed. After everything you`ve already learned, there`s no doubt you`ll find this topic relatively easy! However, the rules of the agreement apply to the following aid obligations when used with a main contract: is-are, was-were, has-have, does-do. While subject-verb correspondence is simple in simple sentences like this, it can become difficult in more complex sentences. This article teaches you the most important rules and the most common mistakes.