In the English grammar, it is very important to make a distinction between, on the one extra verb or the main verb. The two types have different functions in the sentence (that is, they have different jobs), and, therefore, do not change or replace them.
This differentiation, which plays an important role in the area of the language to make sense of it.
The fact is that there are two main kinds of verbs, as it makes it difficult to learn English. In order to solve this problem, we are able to remember the most important distinguishing feature is the main verb in a sentence, only the all – that is, if any. An additional verb, it is only in certain cases, such as with the brief.