Increase your vocabulary, with the word of the day from Merriam Webster Unabridged Click on the blue button that contains the word you hear, with the buttons you can hear the associated word, these buttons show the pronunciation indicated in the Merriam-Webster's Unabridged, it shows the syllable accented with capital letters and the syllabic division with hyphens, and the pronunciation between // is the pronunciation indicated in the Merriam-Webster's Learner's Dictionary .
But not only by the ear, study them using the button and Praat, record your imitation and let yourself decide when you say it.