| A | B |
| to doubt that | dudar que |
| it's doubtful that | es dudoso que |
| it's impossible that | es imposible que |
| it's improbable that | es improbable que |
| to not think/believe that | no creer que |
| it's not true that | no es verdad que |
| to not be sure that | no estar seguro de que |
| to not be of the opinion that | no opinar que |
| to not think that | no pensar (e-ie) que |
| to look for | buscar |
| there is nothing | no hay nada |
| there is nobody | no hay nadie |
| Is there anything that...? | ¿Hay algo que ...? |
| Is there anyone that ...? | ¿Hay alguien que ...? |
| to not have ... that | no tener ... que |
| to want ... that | querer ... que |
| to need ... that | necesitar ... que |
| Is there some ... that...? | ¿Hay algún ... / alguna ... que...? |
| Do you have ... that...? | ¿Tienes ... que...? |
| Do you have something that...? | ¿Tienes algo que...? |
| Do you know someone who ...? | ¿Conoces a alguien que ...? |