1. After (adjectival) nouns
あの人が私たちの学校に新しく来た先生でしょう。 Ano hito ga watashi tachi no gakkō ni atarashiku kita sensei deshō. That person is probably the new teacher who has come to our school.
東京はあす雨のち曇りでしょう。 Tōkyō wa asu ame nochi kumori deshō. It will be rainy and then cloudy in Tokyo tomorrow.
彼女はとてもきれいでしょう。 (with rising intonation) Kanojo wa totemo kirei deshō. She is very beautiful, isn’t she?
2. After (adjectival) nouns + ja nai, datta, or ja nakatta
あの人は日本人じゃないでしょう。 Ano hito wa Nihonjin ja nai deshō. I guess that person is not Japanese.
あのレストランはあまり静かじゃないだろう。 Ano resutoran wa amari shizuka ja nai darō. I guess that restaurant is not very quiet.
山田さんがいなかったなら、きっと静かだっただろう。 Yamada san ga inakatta nara, kitto shizuka datta darō. If Ms. Yamada was not there, it would surely have been quiet.
彼は優秀な学生じゃなかっただろう。 Kare wa yūshū na gakusei ja nakatta darō. I guess he was not an excellent student.
3. After verbs and adjectives in the dictionary form
副社長は三時までに戻るでしょう。 Fukushachō wa san ji made ni modor u deshō. The vice president will probably be back by three.
あなたもいっしょに行くでしょう。 (with rising intonation) Anata mo isshoni ik u deshō. You will go together, won’t you?
そんなことをしたら叱られるだろう。 Sonna koto o shitara shikarare ru darō. You’ll be scolded if you do such a thing.
→ See Passive form under Verbs. 4. After verbs and adjectives in the nai-form