I used to be a chef... but now... I teach!
Teacher
A teacher (also called a school teacher or, in some contexts, an educator) is a person who helps students to acquire knowledge, competence or virtue.
"Informally" the role of teacher may be taken on by anyone (e.g. when showing a colleague how to perform a specific task). 
In some countries, teaching young people of school age may be carried out in an informal setting, such as within the family (homeschooling), rather than in a formal setting such as a school
come the morn" (I may be able to come tomorrow), "A tae coud dae it, but no nou" (I used to be able to do it, but not now).
Negation occurs by using the adverb "no", in the North East "nae", as in "A'm no comin" (I'm not coming), "A'll no learn ye" (I will not teach you), or by using the suffix -"na" sometimes spelled "nae" (