What I like most is your smile
However would it not be: What I like most it is your smile
Why is c'est -> is
It should be
c'est -> it is
What I like most is your smile
However would it not be: What I like most it is your smile
Why is c'est -> is
It should be
c'est -> it is
Your remark is correct, in that in French one often repeats the subject. It's like saying in English: "What I like best, that is your smile." You could omit the "that" in English, but in French it is common to say it.
What I like most is your smile
However would it not be: What I like most it is your smile
Why is c'est -> is
It should be
c'est -> it is
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