Question

unless otherwise后加动词什么形式

Answer 1

unless引导条件状语从句，主将从现，主句用将来时，从句用一般现在时
The concert will be held as schedule unless there is a typhoon.

= the concert will be held as schedule if there is not a typhoon
She will keep on singing unless she is told to stop.

otherwise 作连词，意为“否则；不然”，相当于or或if not。otherwise是虚拟语气的用法，其后用 情态动词+do/ have done
如：
We’ll go early, otherwise we may not get a seat.
我们得早点去，要不然就没有座位了。
I was ill that day, otherwise I would have taken part in the sports meet.
那天我病了，否则我会去参加运动会的。