Cain would not be able to kill if Abel were not there, to be killed. Then, Abel was the cause of the murder. See the table bellow. The constraints are used to specialize a class, making it smaller, with fewer members. In days of the Summer .
Contractions are very frequent in Greek.
Therefore, we can do without a table. You will learn the differences as you go along the text. While English speakers say the water here , the Greeks used to say The here water .