academic
adult
background
basic
board
caucasian
chalkboard
class
classroom
college
education
english
explaining
female
foreign
giving
grammar
green
happy
indoors
information
international
knowledge
language
learn
lesson
modal
pen
person
pointing
profession
professional
professor
scheme
school
smiling
study
teach
teacher
teaching
text
theme
topic
training
tutor
university
verbs
wall
woman
young