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I admire her. (SVO).
Her I admire. (OSV).
The left dislocation of the object is due to emphasis on it.
"I know when he will come."
Here, the object is "when he will come". Is 'left dislocation' possible here and can we say the following?
"When he will come I know."
Yes, it's technically possible, but since the object being dislocated is a clause instead of a single word, it's much more jarring and potentially confusing. This is probably something a learner should avoid.
If you spoke this sentence, you would need to pay close attention to your tone and emphasis, stressing "When" by raising the pitch of your voice, inserting a very slight pause before "I" and then lightly stressing "know" (not as stressed as "when"). In writing, you might need to put "When" in italics and even to insert a comma after "come" to demarcate the clauses. These measures help the listener/ reader correctly parse the sentence since the word order is not the usual one.
