2 answers:
Answer:
Las vacas comen hierba = The cows eat grass.
Las backs comen hierba- The cows eat grass.
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D. He developed a theory on the extinction of dinosaurs
I don't have to work.
2) No tengo que trabajar.
Tengo = I Have
No = Don't
Trabajar = To Work
I am confused about what you are asking for.
I think it's habremos gastado