The example sentences contain one of the words ayam eSas sas asau kas yas, which are all masculine and end in /su. Click the right translation.

Note: the expressions "this one", "that one" will often have to be replaced with "this, that, he, it", but we can't find the correct English unless we know the exact situation. The same thing happens with "which one" and "the one that" -- these will often have to be replaced with "who" or "which" or "what". So stick to the "one" for now.