[译] 假如明天下雨，我们怎么办？
[误] Assumed that it rains tomorrow, what shall we do?

[正] Assuming that it rains tomorrow, what shall we do?
[注] 表示“假定”，应该说 assuming that...，其中 that 也可省略，但 assume 必须用现在分词形式，该结构实际上等于 If we assume that. . .