doubt与suspect的用法比较
一 . 如果后面接名词、代词或名词性词组时，两者基本上可通用。例如：
I doubt/suspect the truth of her statement. 我对她那番话的真实性表示怀疑。
He says he can cure me， but I still doubt/suspect him. 他说他能治好我的病，但我仍对他不放心。
二 . 如果后面接 that 从句，意思就截然不同。 doubt 意为“无把握；不相信（ question the truth of； don't believe/think ）”，怀疑其无。 suspect 意为“有存在或属实的想法；相信（ have an idea of the existence； believe； guess ）”，怀疑其有。例如：
I doubt that he has stolen my watch. 我不相信他偷了我的手表。
I suspect that he has stolen my watch. 我怀疑 / 猜想他偷了我的手表。
The doctor suspected that he was ill with flu. 医生怀疑 / 认为他得了流感。
这时 doubt 更多用于否定句或疑问句中。如：
I don't doubt that he is right. 我确信他是对的。
I didn't doubt that he would come. 我当时相信他会来的。

Why did she doubt that they were cheats？ 她为什么怀疑他们是骗子？

语法易错题
怎么样记忆英语单词
高中英语课本

三 . doubt 用于肯定句中时，多接 whether/if 引导的从句，意义与 that 从句不同，这时意为“不敢肯定（ feel uncertain about ）”。而 suspect 不可接这种从句。例如：
I doubt whether/if he'll come. 我不敢肯定他来不来。
It's raining hard. I doubt whether it will be fine tomorrow. 雨下得很大，我不敢说明天会晴。
四 . 其他搭配。
doubt 可作不及物动词，用于 doubt of sth； suspect 用于 suspect sth to be， suspect sb of（doing） sth .例如：
She never doubted of his success. 她从不怀疑他的成功。
I suspected him to be the spy. 我认为他就是那个间谋。
What made you suspect her of having taken the money？ 你凭什么怀疑钱是她偷的？

一语击破易混词
already/yet “已经”不同
［高手出招］
1 . The train was __________moving when I got to the station.
2 . Have you started writing your composition ________？
3 . He has _______done his exercises.
4 . They've been there twice ________.
［一语击破］
already 主要用在肯定的陈述句中，通常与动词的完成时连用。如：
Our visitors have come already.
already 也可用在疑问句中，常暗示说话人的“惊奇”、“意外”。如：
Have you already had breakfast？
yet 通常与一般现在时或现在完成时连用，多用于疑问句或否定句中。如：
Has she decided yet？
（ Keys： 1. already 2. yet 3. already 4. already ）

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