Spanish language Q&A Forum

I would like to ak why is the accent in the audio on the second syllable?

When is "de la mañana" used?

Hola,

I thought assumption about the past (must have + verb) was expressed by means of DEBE (Deber in El Presented) + Infinitivo Compuesto, however the following examples refute it:

Los chicos han debido de beber bastante porque huelen a alcohol.
They boys must have drunk quite a lot as they smell of alcohol.

El tren debió de llegar sobre las cuatro y media.
The train must have arrived at about four thirty.

Could you please clarify this point, because I'm feeling a bit confused 

"En el mundo hay muchos paises interesantes pero para mí, el más interesante es Australia."

My question is, why is could one also say "lo más interesante..." and still be correct? That is, use "lo" instead of "el"? 

Good morning.

Where in the lesson does it say that the vosotros form of "sonreir" in the imperative has an accent.  Would you direct me to other exceptions of the rule.

Thank you.