他们在东京说英语吗？
a large number of people in tokyo will speak some english, especially in places geared towards tourism. you’ll also find bilingual signs on the tokyo metro, jr lines, and in tourist areas like shinjuku and asakusa.
yes, tokyo is a safe city, but as with any city, there is always a slight risk. as long as you are sensible and don’t go looking for trouble, the chances of any trouble finding you in tokyo are very slim.