Identify the direct object the baseball pitcher threw his teammate on first base the ball a. pitcher b. teammate c. first base d. ball

The baseball pitcher threw his teammate on first base a ball.

first we find the subjectit is pitcher
now we find the verb...it is threw
to find the direct object, find the verb and ask " what "...
so the pitcher threw what ?
he threw a ball...so the direct object is ball.

Acquiring english is a way of learning where you learn english by birth, this includes listening to your parents, brothers and sisters and on the whole learning it from the environment around you while mastering standard english need qualified institutes and teachers who make certain programs and syllabus to you master the standard english. this also can include a long session of academic studies before you can master the standard english.standard english is necessary for literary works, official usage and writing materials for standardized publications or when someone needs to speak publicly. in most cases the employers of a company also demand and like the use of standard english from their employees. 

Word choice and anaphora