1.she is a teacher→she isn't a teacher →is she a teacher?
2.he did his homework last night→he didn't do his homework last night→did he do his homework last night?
3.it is a calculator→it isn't a calculator→is it a calculator?
4.I'm handsome→ I'm not handsome→ Am I handsome?
5.phone is convenient→phone isn't convenient→ is phone convenient?
6.she saw the dog eats her meat→ she didn't see the dog eats her meat→ did she saw the dog eats her meat?
7.he loves me→ he doesn't love me? does he love me?