One such method of translation is called "literal translation" or "formal equivalence". Literal translation tries to be as close as possible to what is written in the original language. Often this means translating each word separately. There are a number of problems with literal translations: First, words must be added, to get a valid grammar in the target language. These words are not in the source text. The second problem is that the reader must be familiar with the subject, to understand some of the translation.