Breakdown of Þetta er bókin sem ég er að leita að.
þetta
this
vera
to be
bókin
the book
ég
I
sem
who / which / that
að
for (searching for)
leita
to search
Questions & Answers about Þetta er bókin sem ég er að leita að.
Why are there two aðs right next to each other in að leita að?
They look identical but do completely different jobs! The first að is part of the continuous tense pattern vera að + infinitive, so er að leita translates to 'am searching'. The second að is the preposition 'for', because the verb leita requires að when you state what you are looking for.
Why is the second að pushed all the way to the end of the sentence?
This is called preposition stranding, and it works exactly like it does in English! Instead of saying 'the book for which I am searching', we say 'the book that I am searching for'. The relative word sem (that) connects the clauses, and the preposition að (for) gets left, or 'stranded', at the very end of the clause.
Bók is a feminine noun, so why does the sentence start with the neuter pronoun Þetta instead of Þessi?
The preposition að usually forces the following word into the dative case. Why is bókin in the nominative case here?
Bókin takes its case from the main clause, Þetta er bókin (This is the book). The verb vera (to be) always triggers the nominative case. Because we use the linking word sem, the noun does not change case to match the stranded preposition at the end of the sentence.
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