来る日も来る日も (day after day)

Day after day, the dog went to the station to meet its master.

Day after day, the dog sat in front of the station waiting for its master.

It snows day after day.

Day after day, I wrote her letters.

Day after day, it rained.

She'll wait day after day, but he probably won't come back.

In June it rains day after day.