Gebruik een vorm van 'to be', 'to have got' of een hulpwerkwoord
To be: Your sister is pregnant. --> Isn't your sister pregnant?
To have got: He has got a new phone. --> Hasn't he got a new phone?
Hulpwerkwoord: You should do your homework. --> Shouldn't you do your homework?
Hulpwerkwoord do/does/did: They live in Canada --> Don't they live in Canada?