if I finish my work 12,I will have lunch with you为什么用TILL 不用BYif I finish my work TILL 12,I will have lunch with you

问题描述:

if I finish my work 12,I will have lunch with you
为什么用TILL 不用BY
if I finish my work TILL 12,I will have lunch with you

till "直到" 用将来时(till = untill)
by “到……为止”用完成时