النحو الواضح في قواعد اللغة العربية الجزء الثالث 9.8

for LG K10 LTE(K420ds)

Open topics in Arabic grammar that the learner can start with when he reaches the stage of maturity - between eleven and twelve, so that he chooses from them - according to his developmental stage - and takes from them what suits his capabilities, and leaves what he deems beyond his capacity.