Ich glaube, dass sie ein hässliches Sofa kauft.

Breakdown of Ich glaube, dass sie ein hässliches Sofa kauft.

ich
I
ein
a, an (eine)
sie
she
kaufen
to buy
glauben
to believe
das Sofa
the sofa
dass
that
hässlich
ugly

Questions & Answers about Ich glaube, dass sie ein hässliches Sofa kauft.

Why does hässliches end in -es?
Sofa is a neuter noun (das Sofa). In this sentence, it is the direct object being bought, so it takes the accusative case. When an adjective comes after the indefinite article ein for a neuter noun in the accusative case, we must add the ending -es.
Why is the verb kauft at the very end of the sentence?
The word dass (that) is a connecting word that starts a subordinate clause. In German, these types of words force the conjugated verb (in this case, kauft) to move to the very end of that part of the sentence.
Is the comma before dass strictly necessary?
Yes, it is mandatory! Unlike in English, where a comma before 'that' is usually wrong, German punctuation rules require a comma to separate the main clause (Ich glaube) from a dependent clause starting with dass.
How can I tell that sie means 'she' and not 'they' here?
You can tell by looking at the verb ending. The verb is kauft, which ends in -t. This matches the third-person singular (he/she/it). If it meant 'they', the verb would be kaufen.

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