Can you say "Estan los ninos durmiendo?" or does that sound awkward in Spanish?
Here are two examples where the subject is placed between two verbs:
¿Están ustedes comiendo?
¿Pueden ellas demostrar eso?
However, i can't find any examples where the subject between two verbs includes an article. Maybe the subject has to be a pronoun for this type of word order? I'm having a hard time finding rules on this type of question structure which doesn't contain interrogative words. The few I have found avoids the topic of subject placement.
Ok I started a discussion topic on this and apparently the verbs can be split: https://www.duolingo.com/comment/11590244$comment_id=11591502
According to this, in the past perfect, for yes-no questions, the subject goes at the end.
The auxiliary verb (haber) and the main verb cannot be separated. http://www.studyspanish.com/lessons/pastperfect.htm
silpha2! Yes gerunds are nouns.,Gerundio is never a noun. Gerundio is for instance used with estar as an auxilary verb and is then like present continuous but restricted to what is happening now.
We are swimming/Estamos nadando BUT Swimming is nice/Nadar es bonito
An English gerund is a (English) present participle that is used as a noun.
The present participle is also used, in English, to form the present progressive (continuous) tense. ( I am running.)
"Running is good exercise" = "El correr es un buen ejercicio". (Although Duo usually does not use the "el" with the gerund-infinitive.)
'I am running" = "Estoy corriendo.
yes, «dormir» is also «put to sleep» see more: http://www.collinsdictionary.com/dictionary/spanish-english/dormir