Strong Deductions with "tener que"
You likely know that tener que + infinitive expresses obligation. Just like in English, it can also express a strong logical deduction or certainty.
When you piece together clues and realize a conclusion is the only logical possibility, use tener que to say that something "has to" or "must" be true.
| The treasure has to be in this dusty attic. | El tesoro tiene que estar en este desván polvoriento. |
| That old trunk has to belong to our great-grandfather. | Ese baúl antiguo tiene que pertenecer a nuestro bisabuelo. |
| The gold locket has to be over there. | El relicario de oro tiene que estar allí. |
You can use this structure with any infinitive to state what must be true based on the evidence around you.
| The key has to be behind this tapestry. | La llave tiene que estar detrás de este tapiz. |
| That old album has to be valuable. | Ese álbum antiguo tiene que ser valioso. |
| The porcelain has to be in the trunk with the tapestry. | La porcelana tiene que estar en el baúl con el tapiz. |
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