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It takes place when a student stays with same mistake for a long time and it is never corrected, like saying "fishes".

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It happens when I make the same mistakes and it become my version of the language because I always say the same things wrong. But, in this process I will eventually get those mistakes corrected.

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It can happen when a learner says "puted" when trying to use the verb "put" in past tense.

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This can happen when we are fisrt learning the tenses and we get mixed up with "do", "did", "had" , "have", etc.

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An error is what I wrote in the first column, before knowing what these words meant, I didn't have knowledge of it.
Slip is when I accidentally say "do" instead of "did" when talking about something in the past, because I know that the correct way to say it, but in that moment I was distracted and I got confused.

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An example of L1 interference is when we think that just because a word sounds similar in both languages it has the same meaning, like embarrassed and embarazada .
A L2 interference example can be when we say "butcher" and pronounce the "u" like in "but", when it is actually pronounced like the "u" in spanish.

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If what I think I know is correct

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The actual definition.

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The concept and definition.

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What it actually refers to

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If what I think it is is the correct definition of it.

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The concept and definition of both.

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Is when a learners error is never corrected and stays with them for a long time or even forever.

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The process that a fossil has to go through.

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It is the learners own version of their second language which they speak as they learn.

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I don't know

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It is when English language learners wrongly apply the rule of an item to another one.

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To speak in a very general way

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That it happens when learners make errors when the information they are working out, organizing or experimenting with has not completed its process.

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When you are trying to develop something and you fail.

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That the L1 interference  is when the first language of the learner has influence over the second. Like sound patterns, lexis or  grammatical structure from their own language. While L2 interference is when we mispronounce the words in the second language because of what we think they should be pronounced.

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When your first language and your second language mix in your head or when yo talk.

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That an error is a mistake we mike, which we think is right, but it something we did not learn correctly. On the other hand, a slip is when yo make mistakes in things we do know and are correct, but it happens due to diverse factors, like being distracted, not paying attention, etc.

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When someone makes a mistake.