出典:Tatoeba
Anyway, I'll tell you when he comes.
In any case, I'll inform you when he comes.
I will, at least, make preparations for his reception.
I don't know when he'll come next time.
If he should come here, I will let you know at once.
Let me know in no time when he comes.
Let me know the time when he will come.
Do you know when he will come?
I don't know when he'll come next time.
I'm not sure when he'll come.