  Based on the celebrated result on zeros of holomorphic 1-forms on complex
varieties of general type by Popa and Schnell, we study holomorphic 1-forms on
$n$-dimensional varieties of Kodaira dimension $n-1$. We show that a complex
minimal smooth projective variety $X$ of Kodaira dimension $\kappa(X)=\dim X-1$
admits a holomorphic 1-form without zero if and only if there is a smooth
morphism from $X$ to an elliptic curve. Furthermore, for a general smooth
projective variety (not necessarily minimal) $X$ of Kodaira codimension one, we
give a structure theorem for $X$ given that $X$ admits a holomorphic 1-form
without zero.
