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

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ifIfinishmywork12,Iwillhavelunchwithyou为什么用TILL不用BYifIfinishmyworkTILL12,IwillhavelunchwithyouifIfin

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
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

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