"observe" 这个词在英语中既可以作为及物动词也可以作为不及物动词使用。下面我将分别给出主动语态和被动语态的造句示例。
主动语态
观察某人做某事 (整个过程):She observed him doing his homework.
注意到某人正在做某事
(无意地):
I observed him crossing the street.
观察到某事物的变化或状态 The scientist observed changes in the experiment. We should observe traffic rules. We observe Christmas every year. 被动语态 He was observed to go into the bank. A beautiful flower was observed by me by the roadside. 某人被要求或命令做某事遵守规则或习惯
庆祝节日或特殊事件
某人被观察到做某事
某事物被注意到或观察到
I was made to go out of the classroom.
注意事项
当使用"observe sb doing sth"时,表示的是有意识地去观察某人做某事。
当使用"observe sb to do sth"时,表示的是观察到某人做某事的整个过程,这里的"to do"是不定式,表示动作尚未发生或不是有意识地去观察。
被动语态中,"to"通常要补全,特别是在"be observed to do sth"结构中。
希望这些例句能帮助你更好地理解"observe"的主动和被动用法。