Hamid khan said:
some people reply but no body didn't advise should we go to border or go to cic local office
the question was if the person don't have excellent english ability and nervous to talk with immigration officer
You're looking for the "risk free" option where you can avoid talking to an immigration officer. Sorry but there is no such option.
In any case, the immigration officer will probably ask you a couple of simple questions, like "where do you currently live" and "have you committed any crimes". It's not like a job interview - just be honest in your answers.
You haven't even submitted your PR application yet, so you have plenty of time to prepare. Certainly if your IELTS or CELPIP results were good enough to apply for CEC, then your English is more than good enough and you will be fine!