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When someone says something with grammar mistakes but they doesn't change it because people of their surroundings understands what they say.

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It is when the learner won't stop making the same error over and over again for his foreign language use.

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An example of interlanguage is saying something that is wrong, but people still understand what you are saying.

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It is the learner's own version of the second language which they speak as they learn.

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When students are learning about a new topic of their second language,  at the beginning they will start making mistakes, but with time, those mistakes will disappear.

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It is when learners wrongly apply a rule for one item of their first language. When students develop their L1 language abilities, these errors disappear, and as a second language learner’s language ability increases, these errors often disappear, too.

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An example of a developmental error is when you start organizing the order of words in a sentence.
For example: at the beginning you may say "the cat black" instead of saying "the black cat".

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Developmental errors is when learners are experimenting with language they haven't learned , without knowing or being aware.

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if you fist language is spanish, you can confuse the word from english "embarrassed" with the word in spanish "embarazada" and confuse their different meanings.

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There are two kinds of errors learners make, the first reason is because of the influence of their first language (L1) and the other one is because of the influence of the second language (L2).

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An example or an error is the wrong use of tenses in English when you don't know how to use them well yet.

An example of a slip, is when you are so mad, that you can't express in your second language.

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Errors occur when learners are trying to say something that it's beyond their current knowledge or English level .

Slips are the result of tiredness, worry or other temporary emotions or circumstances. Learners make them because they are not concentrating on what they're writing or saying.