Expressing concern over poor language skills of English teachers of government schools, Punjab Education Minister Daljit Singh Cheema on Thursday constituted a core group of experts to work out a long-term strategy to improve their English.Disclosing this here today, an official spokesman said the core group consisting of heads of 17 District Institute of Education Training (DIET), heads of 12 Government In Service Teachers Training Institutes (GIST) have been called for a meeting tomorrow in Mohali to chalk out both long-term and short-term strategy to improve the language skills of English teachers.