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★ Which of these do you think is the mostuseful invention? Which of these do you think is the most useful invention?你认为哪一种是最有用的发明。 Do you think 语法上通常认为是插入语，意思是说，去掉它们以后，句子仍然成立。（如果认为you 是主语，think 是谓语，其它成份是宾语从句也有道理）。例如： Who do you think is over there? 你认为谁在那儿呢？ What do you think has happened? 你认为发生了什么事情了？ ★ He was always trying out new ideas. He was always trying out new ideas.他总是在试验一些新的想法。 Be always doing 表示总是在做着表达说话人的一种感情，如赞扬或者批评。例如： My students are always studying hard. 我的学生总是在努力学习。 He is always making some mistakes. 他总是在犯一些错误。 ★ His father saw him sitting on some eggs. His father saw him sitting on some eggs.他父亲看到他正坐在一些鸡蛋上。 See sb.doing 表示看见某人正干某事。同义词组see sb.do 则表示看见某人做了某事。类似see 的动词还有hear,feel,watch.例如： | 
