Spanish language Q&A Forum

Que se cultiva mucho además de la soja?

I´m having fluctuating percentages for topics that I´ve created a notebook for and was correct on for over 30 times in a row. The percentage goes up and down but never significantly improves, even after getting them correct 10 times in a row it will drop from 97% to 91%. Can the percentages consistently reflect progress?

The two topics in particular are:

A0: Using vivo en + [city/country/region] to say where you live in Spanish

A0: How to say I have / you have in Spanish (possession)

How do learners remember when to use the "de" described above? Do native speakers learn it only from growing up with the language? I don't see any particular rule for knowing when to use the "de" and when not to--how "wrong" is it to omit the "de?"

For the example:

De no llegar a tiempo perderíamos el vuelo.
If we didn't arrive on time we'd miss the flight.
I can only see four translations:(1) If we don't arrive on time we'll miss the flight. (or "we could miss")(2) If we hadn't arrived on time we would/could have missed the flight.
Could you please double-check your English translation?  Thanks.

I see that “el” and “la” are based off masculine or feminine. How do I know if a general noun (e.g. car) is masculine or feminine tense?

Are there other similar idiomatic expressions or must one use the conventional gramatical constructs? For example:

If you were me... (Tú que yo?) 

If I were him... (Yo que él?) 

If he were you... (Él que tu?) 

etc. 

How does one use porcentajes with this?