The way in which our innate language abilities are able to influence how successfully we manage to use a language is a somewhat debated and controversial topic within the world of linguistics. Many believe that universal grammar has a very strong influence on how well an individual is able to structure sentences and use grammar while others disagree, at least with regard to how important it is in different situations. It is often argued that universal grammar has at least a moderate influence on first language acquisition, but the affect it has on second language acquisition is where the controversies lie, with many researchers having opposing opinions. Individuals who learn a foreign language frequently experience problems with using correct grammar, at least until they are very advanced in the acquisition process. A lot of the time, individuals learning a second language take a very long time to become as proficient as native speakers are, and they even often never reach the same level of proficiency as native speakers of the language. The significance of this is highly debated however, with a variety of causes being outlined as possible from many different studies.