No. " Somebody can't / couldn't help doing something. No "from".
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azfar1.He couldn't help from laughing at the old woman's silly jokes.
2. He bought half of a loaf of bread for his daughter.You can delete "from" in the first sentence, and the first "of" in the second.
JohnKeatsAm I correct in assuming that "from" is wong after "can't / couldn't help" and that "of" could be kept after "half"?Yes, John, I believe [that] you are!
JohnKeatsAre you laughing at me? [that]Heck, no! I just stuck "that" in to indicate that I was on board.