I’m always on the lookout for good language teaching resources, so here’s one for Hebrew teachers.
http://www.laits.utexas.edu/hebrew

They have some interesting instructional resources including videos and audio. I particularly like the verb root Flash demo in which the root consonants are highlighted in the different verb forms.
http://www.laits.utexas.edu/hebrew/heblang/tutorials/new/visualv/nifal/nifal.html

In Hebrew and related languages (including Arabic), the consonants may be grouped together or separated by vowels depending on the verb form. The closest English parallel would be something like drive ~ drove where the consonants /dr-v/ remain the same, but the internal vowel changes depending on the tense.