causative stem + られる
be made to do (unwillingly)
You were made to do something and you did not want to. The feeling of reluctance is part of the grammar, not an extra word. 五段 verbs usually contract: 飲まされる rather than 飲ませられる. Both are correct; the short form is what people say. **Except す-ending verbs**, which never contract: 話す becomes 話させられる, and 話さされる is simply wrong. The contraction would run into the す itself.
部長にお酒を飲まされました。
ぶちょうに おさけを のまされました。
My boss made me drink.
一時間も待たされました。
いちじかんも またされました。
I was kept waiting a whole hour.
Which pattern is each sentence using?
部長にお酒を飲まされました。
My boss made me drink.
一時間も待たされました。
I was kept waiting a whole hour.