The third one must start with a male person such as (أَبِي / أَخَي / صَديقي) , a verb and a compliment

Answer 1

أَبِي يَقْرَأُ كَتَابًا مُثْرًى.
(Abi yaqra'u kitaban muthran.)
My father is reading an interesting book.

Answer 2

he runs fast in arabic

Answer 3

أَخِي يَرْكُضُ بِسُرْعَةٍ.
(Akhi yarkudu bisur'atin.)
My brother runs fast.