Everything happened as (had been) expected.

▲这类表达是固定的，不宜随便增加成分it，这会改变原来的样子。as expected 看作省略了be动词（had been）是正确的。

本句中，as是关系代词，从表意上又是表方式的从属连词，身兼两职。它指代前文整个句子的内容，as本身又在定语从句中作主语。

▲类似的表达很多，都是省略了be动词，中间还可以加already。例如：

as imagined 正如想象的那样

as planned 正如计划的那样

as arranged 正如安排的那样

as seen from 正如从...看到的的那样

as told before 正如前述

as known to all 众所周知

as shown above 正如上面显示的那样

as already said 正如已经说过的（那样）

as already mentioned 正如已经提到的（那样）

as already described 正如已经描述的（那样）

as already discussed 正如已经讨论过的（那样）

as already noted 正如已经叙述到的（那样）

as already stated 正如已经说指出的（那样）

as already announced 正如已经宣布的（那样）

as already pointed out 正如已经指出的（那样）

as already indicated 如前所示（那样）

as already hinted 正如已经暗示的（那样）

as already told 正如已经告知的（那样）

as already shown 如已显示（那样）

as already emphasized 正如已经强调的（那样）

as already observed 正如已观察到的（那样）

as already explained 正如已经解释过的（那样）

as already suggested 正如已经提出的（那样）