Stressing and summing up (sin duda, en resumen)

Backing up what you say: sin duda, verdaderamente

Sin duda (without a doubt) can open the sentence or sit inside it between commas.

Without a doubt, it's the best restaurant in the neighborhood.
Sin duda, es el mejor restaurante del barrio.
This book is, without a doubt, the most interesting of all.
Este libro es, sin duda, el más interesante de todos.

Verdaderamente (truly) usually goes right before the adjective it strengthens; it is a little more emphatic and more formal than realmente.

It was a truly incredible experience.
Fue una experiencia verdaderamente increíble.

Narrowing it down: concretamente

Concretamente (to be precise) takes something general and pins it down, often after a comma. En concreto is a common alternative.

She lives in the center of Spain, specifically in Madrid.
Vive en el centro de España, concretamente en Madrid.
I need help with the report, specifically with the figures.
Necesito ayuda con el informe, concretamente con las cifras.

Summing up: en resumen, en definitiva, en conclusión

markerwhat it does
en resumengives a short summary of what was said
en definitivagives the bottom line, the conclusion that counts
en conclusióncloses a talk or an essay; the most formal
In summary, it was a difficult but good year.
En resumen, fue un año difícil pero bueno.

En definitiva is frequent in conversation too.

It's expensive and it's far away; all in all, I'm not convinced.
Es caro y está lejos; en definitiva, no me convence.
In conclusion, we need more teachers.
En conclusión, necesitamos más profesores.

Total, que is the casual spoken cousin: it closes a story rather than an argument.

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