Learn Hardcore Portuguese (Portugal): Eu confio em ti.

It means I trust you. In this sentence, Eu stands for I; confio is the first person singular form of confiar (to trust); and em ti literally translates as in you, conveying the idea that the speaker places trust in the person being addressed.

Why is the preposition em used in em ti?

Portuguese requires certain verbs to be linked to their complements by a specific preposition. With confiar, the standard collocation is confiar em (to trust in). This preposition em ensures that the verb correctly connects to its object, which in this case is the pronoun ti.

Why is ti used instead of te after the preposition?

After a preposition in Portuguese, you must use the strong (or stressed) form of the pronoun. Ti is the appropriate stressed form for the informal second person singular following a preposition, while te is the clitic form normally attached directly to a verb without a preceding preposition.

Is the subject pronoun Eu necessary in the sentence?