Ese truco de magia es divertido de ver, pero imposible de hacer.

Questions & Answers about Ese truco de magia es divertido de ver, pero imposible de hacer.

Why do we need de in divertido de ver and imposible de hacer? Couldn't we just say divertido ver?
When an adjective describes how a specific noun experiences an action (like the trick being fun to watch), Spanish requires the preposition de to link the adjective and the infinitive verb. You can't put the infinitive directly after the adjective in this structure.
The lesson calls this a "passive-like" structure. What does that mean here?
Look at the relationship between ese truco (that trick) and the verbs ver (to watch) and hacer (to do). The trick isn't watching or doing anything itself; rather, it is being watched and being done by someone else. Even though ver and hacer are in the active infinitive form, their relationship to the subject is passive.
Does this mean I always use de between an adjective and an infinitive?
Not always! You only use de when the sentence has a specific subject that receives the action. If you used a general or impersonal statement like "It is impossible to do that trick", you drop the de: Es imposible hacer ese truco. The de is only needed because the specific subject (ese truco) comes first here.
Why is "magic trick" translated as truco de magia instead of using an adjective like truco mágico?
While truco mágico is grammatically correct and understood, truco de magia (literally "trick of magic") is the standard, natural way to say "magic trick" in Spain. Spanish frequently uses de + noun to create compound concepts where English simply stacks nouns or uses an adjective.
If the subject was feminine, like esa ilusión (that illusion), what else in the sentence would change?
The adjective divertido would change to match the feminine subject (divertida de ver). However, imposible ends in -e so it stays the same for both masculine and feminine words, and the infinitive verbs (ver, hacer) never change for gender.

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