Help complete the sentence

Question

I have been working on this one for way too long. I have tried many different answers, and none are correct.

Cuando nos olvidamos de entregar la tarea a tiempo, los profesores________.

The two words i am given to fill in the blank are:

ponerse (avergonzado, irritado, nervioso, triste) reírse

I tried the present tense for each. I'm at a lost. Its the last part of a question. I got the rest of got fine, but this has me stumped. I thought it should be se ponen irritado, but that is wrong too.

Answer 1

Did you try:

se ponen irritados

los profesores is plural, the adjective has to be plural to match.

Thanks. Its usually something small like that. - whitewolfjunkie, Mar 12, 2015

lol snap :) - Kiwi-Girl, Mar 12, 2015

Well at least we said the same thing. De nada White Wolf. :) - bosquederoble, Mar 12, 2015

los genios pensamos igual ;) - Kiwi-Girl, Mar 12, 2015

Answer 2

Maybe you forgot or didn't think of putting those adjectives that you listed after "ponerse" in the plural. I believe that the correct answer would be "se ponen irritados" with the adjective "irritado" in the plural, because the noun "profesores" is in the plural as well. Hope I helped you with your question.

Answer 3

If ponerse is correct could it be a simple case of using a singular adjective instead of a plural one?

Se ponen irritadoS?