虚拟语气：名词性从句
suggest、insist 等动词后面的从句要用 (should) + 动词原形。
suggest that he (should) go
要点
- suggest、insist、demand、require、order、advise 等后面接 (should) do。
- 这些词变成名词（suggestion、order）后，从句同样用 (should) do。
- It is suggested/important/necessary that … 从句也用 (should) do。
- insist 表示「坚持说某个事实」时不虚拟。
- suggest 表示「暗示、表明」时不虚拟。
- 英式常写 should + 原形，美式常把 should 整个省掉、只留原形：I demand that he go now. —— 两种都真，省了 should 之后动词仍是原形。
- suggest ／ insist 后面接的是 doing 或名词时，压根不涉这一格：He suggested going by bus. —— 有从句才谈要不要 (should) do。
- should 在这类从句里还能表"没想到"：It is strange that he should say so. —— 这一头的 should 不能省，也不是"应该"。
例句
He suggested that we (should) start at once.
他建议我们立刻出发。
The teacher insisted that everyone (should) be on time.
老师坚持要求每个人都准时。
It is necessary that he (should) be told the truth.
有必要让他知道真相。
My suggestion is that we (should) wait.
我的建议是我们等等。
The committee demanded that the report be published at once.
委员会要求这份报告立即发表。
It is odd that she should know about it.
她竟然知道这件事，真奇怪。
易错提示
- should 可以省略，但省略后动词仍是原形，别加 -s。
- suggest 作「暗示」讲时不虚拟：His look suggested that he was angry.
- 这一格与「虚拟语气：wish / as if」那条的退格是两套，别互相借：suggest that he go（原形）对比 I wish he went（过去式）。
- It is essential ／ vital ／ desirable that… 这一族形容词后面同样走（should）+ 原形；它跟主语从句共用一副架子，细则见「主语从句」。