A true necessary condition in a conditional statement makes the statement true (see  truth table  immediately below). In formal terms, a consequent N is a necessary condition for an antecedent S, in the conditional statement,  N if S ,  N is implied by S , or N S. In common words, we would also say . N is weaker than S  or  S cannot occur without N . For example, it is necessary to be Named, to be called Socrates. A true sufficient condition in a conditional statement ties the statement's truth to its consequent. In formal terms, an antecedent S is a sufficient condition for a consequent N, in the conditional statement, if S, then N ,  S implies N , or S N.
The Heart of Teaching: What It Means to Be a Great Teacher. What does it mean to be a great teacher? Of course credentials, knowledge, critical thinking, and all other faculties of intelligence are important. However, a great teacher should be much more than credentials, experience and intelligence.
...Creative and Instructional teachers motivate their students to learn by using their personal qualities, positive experiences, and excellent communication skills. A teacher is an individual who plays the most vital role in the development of any being. The future of any student depends on the qualities and dedication of a teacher. It is the teacher who creates an interest in students to develop and progress and achieve what ever aims they set for themselves. A good teacher requires skills of Leadership, organization and communication.