Sentence:  In imperfect <WSD>consecutives</WSD>, stress shifts from the final to the penultimate syllable, as in "wayyáaqom" 'and he arose', from the related jussive "yaaqóom" 'let him arise' (the final vowel is underlyingly short); this shift is blocked, however, if the penultimate syllable does not contain a long vowel, as shown by "wayyabdéel" 'and he divided'. 
Meaning of the word marked with <WSD> tags:  A linguistic form that implies or describes an event that follows temporally from another.