The two forms are 'no + verb' and 'don't + verb'. Earlier Jseemed
to use these two forms randomly, but at this stage he displayed a
measure of consistency. 'No + verb' was used to make negative
statements while 'don't + verb' was used in negative requests.
Learners, it seems, try to make their available linguistic resources
work to maximum effect by mapping one meaning on to one
form. The resulting systems are often very different from the
target-language system. With time, of course, they become more
target-like