I think its bajara which means go down and subira means go up .
Answer:
1. Éste ha sido tu mejor año. No estoy segura que éste haya sido mi mejor año.
2. El ejercicio le ha alividao el estrés. Dudo que el ejercicio le haya aliviado el estrés.
3. Rafael y tú han sufrido muchas presiones. Niego que Rafael y yo hayamos sufrido muchas presiones.
4. El gobierno ha estudiado el problema. Es improbable que el gobierno haya estudiado el problema.
5. Ustedes han sido muy buenos amigos siempre. No es cierto que ustedes hayan sido muy buenos amigos siempre.
6. Has hecho todo lo que pudiste. No es seguro que hayas hecho todo lo que pudiste.
Explanation:
1. This has been your best year. I'm not sure it was my best year.
2. Exercise has relieved you or stress. I doubt that exercise has relieved your stress.
3. Rafael and you have suffered many pressures. I deny that Rafael and I have suffered many difficulties.
4. The government has studied the problem. It is unlikely that the government has studied the problem.
5. You have always been very good friends. It is not true that you have always been very good friends.
6. You have done everything you could. It is not certain that you have done everything you could.
