There are two points I would like to make a comment on.
There are two points I would like to make a comment on. The first is about correcting mistakes. We often hear that the best / most natural (I know Penny's reservations about "authenticity") way of learning a language is the way it is acquired in L1. But during the thousands of hours of meaningful, contextual input, there is also an immense amount of correction taking place, as anyone could testify who has ever listened to the "motherese" going on between a 3-year-old and their mum on the tram... The second comment concerns translation. I think that, especially for languages that are close to English, for example, Spanish, it would be a shame not to point out the similarities: "This is my house" - "Esta es mi casa." Obviously, as soon as we insert an adjective, the word order does not correspond to each other (is "to each other" a tautology or just redundancy, Penny?) any more, but that is not a reason why we should not alert student...