Lo siento, es que no he podido exponer la conclusión.

Questions & Answers about Lo siento, es que no he podido exponer la conclusión.

Why use es que here instead of just saying no he podido...?
Es que is a very common conversational phrase in Spanish used to introduce a justification or an excuse. It translates best to 'it's just that' or 'the thing is'. Using it makes the apology softer and much more natural than stating the reason abruptly.
Doesn't exponer mean 'to expose'? Why is it translated as 'to present'?
It is a partial false friend. While it can mean 'to expose' (like skin to the sun, or uncovering a secret), in academic or professional contexts, exponer is the standard verb for 'to present', 'to exhibit', or 'to set forth' ideas. In fact, an oral presentation is called una exposición.
Why is the present perfect (he podido) used here instead of the simple past (pude)?
In Spain, the present perfect is heavily used for actions that just happened or belong to a time frame that feels ongoing to the speaker. The person is likely apologizing right after running out of time or being interrupted, so the inability to finish is immediately connected to the present moment.
Could I use presentar instead of exponer in this sentence?
Yes, presentar la conclusión is perfectly correct and would be understood. However, exponer is an excellent B2 vocabulary word because it sounds slightly more precise and natural when talking about laying out arguments, steps, or parts of a speech.

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