Learn Spanish (Latin America): Cuando la ciudad crece rápido, hay más contaminación. - When the city grows fast, there is more pollution.

Cuando la ciudad crece rápido, hay más contaminación.

When the city grows fast, there is more pollution.

Breakdown of Cuando la ciudad crece rápido, hay más contaminación.

to be (there is / there are)

más

Questions & Answers about Cuando la ciudad crece rápido, hay más contaminación.

Why is crece in the present indicative here, rather than the subjunctive?

Because this sentence describes a general fact or a recurring situation. In Spanish, cuando is followed by the indicative to state what generally happens. If you were referring to an uncompleted future event (like "When the city grows fast next year..."), you would use the subjunctive (cuando la ciudad crezca...).

Why use rápido instead of rápidamente to mean "fast" or "quickly"?

You can use either! Rápido is technically an adjective, but in everyday Spanish, it is very often used as an adverb to modify a verb (like crece). Rápidamente is also correct and means the exact same thing, though it sounds slightly more formal.

Is there an easy way to remember the gender for words like ciudad and contaminación?

Yes, there is a very reliable rule for these endings. Nouns ending in -dad (like la ciudad, la verdad) and -ción (like la contaminación, la emoción) are almost always feminine.

How would I change this sentence to use soler to say "When the city used to grow fast..."?