Questions & Answers about Tu disculpa sincera me hace sentir tranquilo.
Spanish has two different words:
- tú (with accent) = the subject pronoun you (informal, singular)
- tu (without accent) = the possessive adjective your
In the sentence Tu disculpa sincera me hace sentir tranquilo, tu is describing disculpa (your apology), so it is the possessive adjective and does not take an accent.
If you wrote Tú disculpa sincera…, it would mean You sincere apology…, which is ungrammatical.
All three are related to apologizing, but they’re used differently:
- disculpa (noun) = apology.
- Tu disculpa sincera = Your sincere apology
- perdón (noun) = pardon / forgiveness / excuse.
- Tu perdón = your forgiveness
- lo siento (expression) = I’m sorry (literally I feel it), not a noun.
In this sentence, you need a noun that can be possessed by tu: your X.
So disculpa (apology) fits perfectly:
- Tu disculpa sincera = Your sincere apology
You couldn’t say Tu lo siento sincero, because lo siento is not a noun.