She inquired why he had not thought of that before. 這句話是，她詢問為何他以前沒有想到這一點。(這句的文法是 過去式+過去完成式 這樣子嗎??)
Why didn't you think of that before?(我可以直接用這句嗎？？)
改寫為直接問句的形式為: She inquired him, "Why didn't you think of that before?" 引號中的話語正是您寫的句子, 完全正確. 主要動詞inquired為過去式, 改為間接問句時, 引號中的過去式要退一級為過去完成式. 要注意間接問句句尾要用句號, 除非主句為問句時句委才會用問號, 例如:Did she know why he had not thought of that before?
I felt annoyance at being teased. (feel 感官動詞 後面通常不是+形容詞? 為什麼會接名詞呢？)
felt是感官動詞, 後接主詞補語(SC). SC可以為形容詞, 也可以為名詞.I felt annoyance at being teased. (O)= I felt annoyed at being teased. (O)
He has qualification for this position.
He has qualified for this position.(能用完成式嗎?)
不可以, 您的句子錯誤. 正確應是:He is qualified for this position.
也可以寫為:He qualifies this position. (意思略有不同, 是「當得起....」之意.
He makes inquiries about stock prices.(不懂為何要用make)
He inquires about stock prices.(不能直接這樣??)
注意三單主詞的動詞要加s. make inquires (動詞+受詞)
= inquire inquire可為及物或不及物, 您改寫的句子是對的, 而其中about可有可無.
Parents are obligated to support their children. 這句應該是主動吧!
還是obligated 是形容詞? 所以本來就必須be obligated to ?
be obligated to VR 被加義務作某事, 被動式是固定用法. 也可把obligated當形容詞來理解, 意為「有義務的」
I was driving along when the car in front of me stopped suddenly. Unfortunately I couldn't stop in time and drove into the back of it.
（～I couldn't stop in time and drove into...前面couldn't stop ..and drove... 助動詞後面的動詞不是應該原型動詞嗎？？) couldn't stop + couldn't drive 才是等於couldn't stop....and drive.... 語意上, 本句的drove是與couldn't對等結構, 而不是與stop對等.
2012-06-08 17:53:08 補充：
I was driving along when the car in front of me stopped suddenly. Unfortunately I couldn't
stop in time and drove into the back of it.
當前車突然停住時我正往前開著車, 不幸的是, 我無法及時煞住而撞上其車尾了.
Infinito無極 + 文法