to be (of animate objects); to exist
to stay
to be ...-ing
to have ...-ed; to be ...-ed
be; is
to stay on (e.g. at one's friends house); to remain (in a place)
教室に学生が五人いる。
There are five students in the classroom.
道を教えていただけますか。
Could you tell me the way?
昨日、公園に子供がたくさんいた。
Yesterday, there were many children in the park.