Is said whole, with nothing composed onto it and takes no だ/です, so there are no forms to conjugate.
一杯飲みましょう
ippainomimashoulet's have a drink togetherexpression
Example sentences2
久しぶりに一杯飲みましょう。
hisashiburi ni ippai nomimashou.
Let's have a drink together, it's been a while. neutral
今夜、一杯飲みましょうよ。
kon'ya, ippai nomimashou yo.
Let's have a drink tonight, come on. neutral