to substitute for someone temporarily
временно заменять кого-то (vremenno zamenyat' kogo-to)
"The assistant will sit in for the teacher today."
"Ассистент сегодня сит ин фор учителя." (Assistent segodnya sit in for uchitelya.)
to become more mature in handling emotions and relationships
to start making progress toward something
to start feeling comfortable or friendly toward someone
to feel you should thank someone for something
to quit or withdraw from a competition or activity
to write what someone says; to make notes
