Если бы ты позвонил ему заранее, мы

Если бы ты позвонил ему заранее, мы бы сейчас знали, когда он придёт

Results (English) 1:

If you called him in advance, we would now know when it will come

Results (English) 2:

If you called him up in advance, we would know now, when he comes

Results (English) 3:

if you call him in advance, we now know when he will come