to substitute for someone temporarily
substituer temporairement quelqu'un (substituer temporairement quelqu'un)
"The assistant will sit in for the teacher today."
"L'assistant s'asseoir pour l'enseignant aujourd'hui." (L'assistant assis pour l'enseignant aujourd'hui.)
to move the page upward to see earlier content
to organize actions to reach a common goal
to make yourself nervous or upset; to become tense or worrie...
to cooperate with others to achieve a goal
to share opinions or ideas with someone from another culture
to register or create an account on a website