Breakdown of El domingo vimos un pez muy grande en el río.
grande
big
un
a, an, some
muy
very
en
in / on / by (means of transport) / about (after pensar)
Questions & Answers about El domingo vimos un pez muy grande en el río.
Why is it El domingo instead of En domingo for 'On Sunday'?
In Spanish, you use the definite article (el or los) before days of the week to say 'on' a certain day. You never use en for this. So, el domingo means 'on Sunday'.
How do we know it means 'we saw' if there is no word for 'we'?
Why is the word for fish pez here instead of pescado?
Pez is the word for a live animal swimming in the water, like the one in this river. You use pescado once the fish has been caught and is considered food.