Breakdown of Detta akvarium är dubbelt så stort som det gamla.
vara
to be
stor
big
gammal
old
den
the (with en-words)
Questions & Answers about Detta akvarium är dubbelt så stort som det gamla.
How does the structure dubbelt så stort som work to mean "twice as large as"?
Why do we use stort instead of stor here?
The adjective is describing akvarium, which is an ett word. Therefore, the adjective must take the neuter -t agreement ending to become stort.
Why is the noun indefinite in detta akvarium, rather than definite like in det här akvariet?
When you use the formal demonstrative pronouns denna, detta, or dessa for "this/these", the following noun must be in its indefinite form. If you used the more conversational det här, you would need the definite noun: det här akvariet.
How does det gamla translate to "the old one" without a word for "one"?