Transferred epithet - The mood changes to one of agitation/over-excitement to indicate the burgeoning awareness of sexuality that comes with the onset of adolescence.
"tasted of electricity"
Synaesthesia describes one of the symptoms of hormonal change. The tension in the air is like 'electricity' which is experienced as a taste in the mouth. Connotations of danger/ storms emphasise the turmoil of puberty & adolescence.
"tangible alarm"
Word choice highlights the confusion the children feel at this point in their lives. They are agitated and excited in equal measure.
"untidy, hot"
List/ word choice highlights all of the symptoms of growing up and puberty.
"heavy, sexy sky."
Transferred epithet: it is not the sky that it is 'sexy,' it is the thoughts, hormones and feelings of these young people at the point of sexual maturation.
"smiled, then turned away."
Enjambment shows that she is firmly in the past – she is a primary school teacher and does not have to, or want to, answer questions about sex. The line break highlights the new distance between the teacher and her pupils.
"impatient to be grown"
Parenthesis: eager and excited to experience the world outside the safety of the classroom.
"as the skysplit open into a thunderstorm"
The pathetic fallacy has a multitude of meanings: it signals the end of the protectedbubble Mrs T kept her class in. The real world can be uncompromising, uncomfortable and terrifying – like a thunderstorm. Life can also be exciting, exhilarating and thrilling like a thunderstorm. The thunderstorm represents the overwhelming rush of emotions and hormones.