Teachers tell students to use a variety of expressions in their writing, and not stick to the same, tired words and expressions. Well, the kids do take heed of our advice; they do try.
Take, for example, the word “suddenly”.
Most students are able to substitute this quite correctly with other expressions such as “out of the blue” or “all of a sudden”.
However, a small handful would persist to say, “out of a sudden”. Do note that this expression is erroneous.
I occasionally also notice other errors of expression such as, “turn into a new leaf” (to describe someone who starts behaving in a better way). This should instead be written as “turn over a new leaf”.
Unless you can claim to do magic, there’s no way you can turn “into” a new leaf!