[For you to come] would be a mistake. -- SVC
It is mistake [for you to come]. -- SVC
I would like
for[you to learn how to use the computer]. -- SVO
Why is the biformity?
In each bracketed subordinate clause, "you" acts as a subject. It appears to me that when the subordinate clause hinges on an adjective, a preposition "for" precedes the subject. To put it differently, in SVCs, when the C is a clause, S is preceded by a "for".