Billy is a  nice  boy . he knows a lot , but he never ________.

 --Mike, can you tell us something about our new teacher? -- Oh, sorry. I know nothing because I     _ him before.

– Are you a teacher of English?–No, but I ___________.

You can’t expect          a new language in a few months.

---Will you go boating tomorrow?  ---I’m not sure. It _____ the weather.