1_ what are meaning these sentences?
八 点 上课,他 八 点 半 就 来 了。
he came at 8:30 -- stated action in the past
八 点 上课,他 八 点 十分 才 来。
he "managed to come" at 8:10
昨天 我 去 北京 吃饭,八 点 坐 车,八 点 半 就 到了。
yesterday i went to Beijing to have a meal, took a bus at 8, got there at 8:30
今天 我 去 诶经 吃饭,八 点 坐 车,八点 才 到。
today i went to eijing to have a means, took a bus at 8, managed to got there at 8 -- the sentence is definitely wrong (must be at least several minutes or the phrase next day)
2_in this sentences 好 meaning finished?
自行车 修好了 吗?
the result of repairment, "was the bicycle repaired?"
3_
what are meaning these sentences?
没关系 你 用 吧。 = doesn't matter, you use it.
不 用 了。 = no need