Abstract: This study sought to establish aspects of written English grammar that incurred attrition due to the long closure of schools amidst Covid-19 pandemic. Kenyan secondary school students learn listening and speaking, reading and writing skills through English, the language of instruction (LOI), a second language which attrited dismally amidst the Covid-19 pandemic making educators, teachers of English and the general Kenyan public worried. Language attrition in Kenyan secondary schools was three-fold. First, as a result of declining use of English as a second language by students who changed their linguistic environment, that is students’ discontinued contact with the L2 in classroom practices.