Bad English?!

If a library visitor accused you of bad English, try this:
“Since you think my English is bad, I am sorry you will have to ask my colleague to help you because I do not want to mislead you”.
Or if you are flying solo:
“I am sorry my English is bad for you, I am afraid I cannot help you because I do not wish to mislead you by any chance”.

Bored interviewer?

Finish what you are saying
Before the next question, ask the fidgeting one
“What do you think about my statement, sir (madam)?”
Try it and let me know the result!
Read the book recommended to me by my kind interviewer, Sweaty Palms, if you have a chance.