Is it ALWAYS necessary to use the article? I wrote just "Escrevem" for "they write" - what else could it be?
"Eles" is not an article; it's a pronoun. Articles are what translate to "the"/"a"/"an", and pronouns are words that take the place of a noun.
But thats not so common (to omit in this example because it is too short and with no context). So, the better option is using it. When you have a previous context there is no problem to omit "eles". ("O que eles fazem?" -"escrevem")
For me, they are the same for both languages. You do not need to add the pronoun when it is implied in the sentence.
Escreve is the 3rd singular form. Ele escreve
Escrevem is the 3rd plural form. Eles escrevem
oh, thank you so much :D. I think DUolingo could also make a chart to help us.
They do. Mouse over a verb, then click on the pop-up where it says "conjugate."
When free-writing, just go with one. It's only when both are options in a multiple-choice question that you need to select both.
Eles escrevem is an acceptable answer.
Elas escrevem is an acceptable answer.
Eles/elas escrevem is not an acceptable answer.