I could not understand the lecture ,and___?

I could not understand the lecture ,and___? but I （could） not understand him The porter,however could not understand me Then he spoke slowly, but I could not understand him I could not the actors. I think I could understand I do not understand! I do not understand I did not attend the lecture by jackson,I ____ but I ___ all I could not make ----English A myself understand in B myself —— many times,I still could not understand how to operate th I simply could not understand how it came about that you did