__________ is a concept which describes where the learners' current language mastery stands on a scale from knowing nothing of the target language to complete mastery.
An error produced before a learner has encountered the item or been taught it is described as __________.
An error which is not immediately obvious can be described as __________.
An error in selecting the wrong word for something is usually called a(n) __________ error.
An error in grammar or structure is usually called a(n) __________ error.
An error in selecting the wrong level of formality or, e.g., ways of addressing people is often called a(n) __________ error.
An error caused by assuming that all verbs in the past tense end in -ed is one of overgeneralisation or ignorance of rule __________.