第一次课
taking a taxi
taking a bus
第二次课
—Alphabet
—5~10 words to learn for each session
—shorter sentence；easier conversation
faster、fast、slow、slower、have、keep、use、since、make
第三次课
—words：this、that、these、those、there、where
want、can、get、take、need、have to
—some situations of seeing a doctor