我常常纳罕,我以前怎么竟会认为他才干不足呢!用英语怎么说？

我常常纳罕,我以前怎么竟会认为他才干不足呢!

I often wondered how I had conceived that old idea of his inaptitude.

often

adv. 常常，经常，时常，再三；

例句
Genetic abnormalities are more often associated with faults in paternal DNA than in maternal DNA.
相对于母本DNA,基因畸变往往更多地与父本DNA上的缺陷相关。

wondered

vt. 对…感到好奇（wonder的过去式与过去分词形式）；

例句
I wondered why he had gone through the elaborate charade...
我不明白，他为什么要大费周章，装腔作势。

how

adv. 怎样，健康状况如何，到何种地步，以任何方式；n. 方法，方式；

例句
He showed how the rich and powerful can abuse their position.
他让我们看到有钱有势的人是如何滥用其地位的。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

conceived

v. 想出( conceive的过去式和过去分词 )，构想，设想，怀孕；

例句
Sunset Boulevard was originally conceived by Wilder as an astringent satire on Hollywood.
怀尔德最初是想把《日落大道》拍成一部对好莱坞的辛辣讽刺片。

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

old

adj. 老的，古老的，以前的，（用于指称被替代的东西）原来的；n. 古时；

例句
She was old enough to absent herself from the lunch table if she chose...
她长大了，可以自己做主不来吃午餐了。

idea

n. 主意，想法，[哲]理念，观念，[乐]乐句，模糊想法；

例句
It is often a good idea to start with smaller, easily achievable goals.
一开始把目标定得低一点、容易实现一点，总不失为一个好主意。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

inaptitude

n. 不适当；

例句
His inaptitude for the job is very unfortunate.
非常遗憾他对此工作无法胜任.