In his son's eyes , the author is the father who he has to obey and an oddity absorbed in grammar.(Para1 )
The author started to be serious about the language learning problem after he ran into his student whose inabilit to describe properly her excursion to Europe made him shocked. (Paras . 2-4)
Thesis of the narration: It is unfair to blame students for their language deficiency. (Para. 5 )
Body
The first section
Claims why students shouldn't be blamed for their language deficiency by providing two major reasons. (Paras.6-7)
Validates the author's viewpoint using the grammar lesson with his son:Students can learn better.(Paras.8-10)
The second section
Elaborates the importance of grammar and vocabulary in learning English by way of metaphors. (Paras. 11-12)
Re-emphasizes the author's point of view using the grammar lesson with his son:Students can learn better . (Paras. 8-10)
Conclusion
Narrates another incident where his son unconsciously uttered a grammatically perfect sentence with a subjunctive mood, which make the author so proud of his son.(Para.13)