suspect和doubt的区别如下：
doubt和suspect的不同主要表现在怀疑的结果与后接从句两方面。
怀疑的结果不同：doubt的意思是“疑为非”，suspect的意思是“疑为是”。
I doubt that she is the criminal.
我不相信她是罪犯。(认为不见得)
I suspect that she is the criminal.
我怀疑她是罪犯。(认为有可能)
后接从句不同：doubt后可接whether或if从句,但suspect则不能。
Do you doubt what I say?
你怀疑我说的话吗?
I doubt whether he will marry her.
我怀疑他是否会跟她结婚。
doubt造句：
his raises doubts about the point of advertising.
这对做广告的意义提出了疑问。
Others doubted whether that would happen.
其他人认为那未必会发生。
No one doubted his ability.
没有人怀疑他的能力。
No one directly involved with the case doubted him.
与此案直接相关的人中没有人怀疑他。
A referendum showed beyond doubt that voters wanted independence.
全民公决无疑显示选民支持独立。
suspect造句：
I suspect they were right.
我感觉他们是对的。
He suspected that the woman staying in the flat above was using heroin.
他怀疑楼上公寓里的那个女人正在吸食海洛因。
Delegates evacuated the building when a suspect package was found.
发现可疑包裹后，代表们撤离了这座楼。
The above complaints are, I suspect, just the tip of the iceberg.
我想，以上的抱怨只是冰山一角。
Do women really share such stupid jokes? We suspect not.
女人们真的会觉得如此愚蠢的笑话好笑吗?我们想不会。