用作定语
▲～+n.
He is a dubious character.他是一个靠不住的人。
He is a rather dubious fellow.他是一个相当靠不住的人。
▲n.+～
His background is a trifle dubious.他的背景不大可靠。
用作表语
▲S+be+～
What he said was dubious.他说的话很含糊。
▲S+be+～+prep.-phrase
I'm still dubious about the plan.对这一计划我仍然持怀疑态度。
I am dubious of her honesty.我对她的诚实半信半疑。
I feel dubious as to what to do.我犹豫不决,不知该怎么办。
