itwasadecision,i,thathewilllaterregretAdetectBdoubtCclaimDsuspect为什不是Bitwasadecision,i,thathewilllaterregretAdetectBdoubtCclaimDsuspect为什不是B呢他们后面都可以加that呀

Question

it was a decision,i_,that he will later regret A detect B doubtC claim D suspect 为什不是B
it was a decision,i_,that he will later regret
A detect B doubtC claim D suspect 为什不是B呢他们后面都可以加that呀

Answer 1

suspect更书面化、正规化,而且一般就直接写suspect sth,没有suspect if/whether这样的搭配.suspect that 倒是比较常用,比如：
I suspect that she told a lie.我怀疑她说谎
而用doubt that时,后面要接的是 将要发生或已经发生的一个事实,表示我对这件事的怀疑.而且doubt that通常用在否定句里,表示“恐怕、不会”的意思.用于肯定句的话,还是doubt if/whether更符合习惯.
I doubt if she will change her mind.意思是我怀疑她是不是真的会改变想法.
I doubt that she will change her mind.意思是我恐怕她不会改变想法