I want to know how to stop on hamzah with two fatah, two kasrah and two dummah, please.
We stop on the hamzah with a tanween fath (which looks like two fathahs) by substituting an alif for the tanween. So we stop with an alif, such as in the word:
. Please also see: http://www.abouttajweed.com/the-mudood-the-lengthenings-/the-mudood-lengthenings-part-3.html
We stop on the hamzah with a tanween kasrah (looks like two kasrahs) or tanween dhammah (looks like two dhammas) with a sukoon on the hamzah and do not pronounce the vowel at all.