if, although
Verb, Adjective, or Noun + (だろう / でしょう) +
Used at the end of a sentence to express a strong feeling of regret, sympathy, or frustration about a situation that did not happen or turned out poorly. The words だろう and でしょう are optional, but are commonly added before the particle
Verb / い-Adjective (informal) + (だろう / でしょう) +
Attaches to the informal plain or past tense of a verb or an い-Adjective. だろう or でしょう can be optionally inserted before
早く出発すれば間に合った
If you had left early you would have made it in time, but...
たくさん勉強したでしょう
You must have studied a lot, but...
もう少し待てば安かった
If you had waited a little longer it would have been cheaper, but...
外はとても寒いだろう
It must be very cold outside, but...
な-Adjective stem / Noun + (だった) + (だろう / でしょう) +
Attaches to the stem of a な-Adjective or directly to a Noun. For the past tense, だった is added. だろう or でしょう can optionally be placed before
本当は好きだった
You really liked it, but...
あの作業は大変だろう
That task must be tough, but...
昨日は休みだった
Yesterday was a day off, but...
ずっと病気だったでしょう
You must have been sick the whole time, but...
This particle