The phrase "I am overcome" is a correct and usable phrase in written English. It is generally used when someone is filled with strong emotion, such as joy, love, or admiration. For example, "When I saw the Mona Lisa up close, I was overcome with emotion.".
I am overcome by emotions".
I am overcome by joy and sadness.
"I am overcome by ordinary contentment," Jane Kenyon has written.
I am overcome by the profundity of the experience".
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Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia