Answer:
1) La mujer esta caminando.
2) Los estudiantes estan escribiendo.
Answer:
1, 2, 3, 4, 6 and 8 are incorrect although I'm not sure if you're asking if they.re right or for help putting them together.
Explanation:
Just in case:
1: I left: Sali
2: I am leaving: Salgo
3: He eats a lot: Come mucho
4: He ate a lot: Comio mucho
5: They will arrive: Llegaran
6: They arrived: Llegaron
7: You will work: Trabajaras
8: You work: Trabajas
Hope this helps :)
When you use "por" or "para" your saying the word "for" so for example
enlgish: I need to go for a game
spanish:yo nesicito ir para un juego
so technically you use it when the sentence has the word "for" or the word is needed
