when
I was just reading a book when she came into my room. 她走进我房间时,我正在看书.
while
While Jim was mending his bike, Lin Tao came to see him. 正当吉姆修自行车时,林涛来看他.
before
They had hoped to be able to arrive before ten. 他们本来打算能在10点之前到达.
after
It can help people to catch bad people and look after people's children or house.它可以帮助人们抓住坏人,帮助照顾人们的孩子或房子
as
come here late as there is no bus around
我来迟了因为附近没车
until
Continue in this direction until you see a sign. 一直朝著这个方向走就看见指示牌了

till
Don't open it till your birthday. 等到你过生日那天再打开.
as soon as
I’ll write you as soon as I get there. 我一到那儿就给你来信.