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If I recall correctly, Portuguese is unique among Romance languages for having infinitives that take pronoun clitics and so form equivalents to English constructions such as "for you to (do X)" or "for us to do (X)."
Are there one or more Germanic languages that each have grammatical constructions that are not found in any other Germanic language? If so, what are some of these constructions?
Swiss German has a strange cross-serial semantic dependency explained here:
http://www.eecs.harvard.edu/shieber/Biblio/Papers/shieber85.pdf
This is the "We Hans the house helped paint" brought up whenever someone wished to argue that natural language is not a context free grammar. This is a silly use of this construction, but it does answer your question, because cross serial attachement is consiered ungrammatical in German German.
Alemannic (aka Swiss German) Verb Doubling. A verb surfaces twice but is semantically computed once.
go 'go'
De Hans got go poschte
the John goes go shop
"John goes shopping"
afo 'begin'
denn fot s bluet afo zirkuliere
then begin the blood begin circulate
"then the blood begins to circulate"
renne 'run', go 'go'
Here, 'go' "doubles" 'renne'. My source accounts for it with generative semantics.
do isch alles an d Fänschter grennt go lose
then has all to the windows run go listen
"this is when everybody ran to the windows and listened"
This syntactic phenomenon, Alemannic Verb Doubling, does not exist in other Germanic varieties. Source: I'm writing my thesis on this.
