1.infer的基本意思是“推断,推知”,多指读者、听者或旁观者在所见所闻的事物中推论出某事的内涵。引申则表示“意味着”。
2.infer可用作及物动词,也可用作不及物动词。用作及物动词时可接名词或从句作宾语。
3.infer宾语后接介词from表示“从…推断出”,宾语是从句时, from短语可以提前。
4.infer的过去式、过去分词均为inferred。

infer from(v.+prep.)
〈正〉从…中推导出 reach (an answer) by reasoning from (given facts)
▲infer sth from sth
I inferred this fact from the evidence I had gathered.我从收集到的证据中推论出这个细节。
No one can infer such an opinion from his statement.谁也不能从他的声明中得出这种看法。
They inferred his displeasure from his absence.他没有到场,他们由此推断他生气了。
What can we infer from these facts?从这些事实中我们可得出什么推论呢?
◇ 用于be ～ed结构
What can be inferred from it?由此可以推断出什么呢?

用作不及物动词
▲S+～(+A)
Men observe and infer in all sorts of ways.人们通过各个途径进行观察和推断。
用作及物动词
▲S+～+n./pron.
We see smoke and infer fire.我们看到烟,从而推断有火。
Ragged clothing infers poverty.破衣烂衫暗示贫穷。
Your silence infers consent.你的沉默表示同意。
▲S+～+that-clause
I infer that he'll be home for dinner.我推测他会回家吃饭。
People inferred that so able a governor would make a good president.人们推测如此有能力的州长会成为一个好总统的。
I infer that my proposal has been accepted.据我推测我的建议被接受了。
He can logically infer that if the battery is dead then the horn will not sound.他可以符合逻辑地推测,如果蓄电池用完了,喇叭也就不会响了。
From what do you infer that I will not agree to the plan?你根据什么断定我不会同意这项计划?
I infer from your letter that you do not want to see us.我从你的来信看出你不想见我们。
The jury inferred from the testimony that the defendant was lying.陪审员根据证词推断被告在说谎。
▲S+～+wh-clause
 We had to infer what she meant.我们不得不推测她的话是什么意思。

infer, conclude, deduce, gather, judge
参见gather条。
infer, imply
这组词都与“暗示”有关:imply指作者或讲演者用某种方式暗示的意思; 而infer是指读者或听众从“暗示”中推断。例如:
The speaker or writer implies things; the listener or reader infers things.讲演者和作者暗示事情,听者和读者则从中推断事情。