英语语法题
关于什么时候加ing，是么时候不加。像下面两道题，分析一下
I heard someone （ ）for help outside when i was lying in the bed this morning (shout)
The boy ( )in the teacher's office was found( ) at the school gate yesterday (stand)(smoke)
例如,这道题的意思是:今天早上当我躺在我听到有人在外面大呼求救.既然是听到有人喊,,应该是正听到吧?所以是现在进行时.你还需知道hear的用法:hear sb. doing sth. 听见某人正在做某事
hear sb. do sth. 听见某人做某事，指叙述动作本事，不强调“正在做”。
eg: I hear somebody singing English songs in the next classroom. 我听到隔壁教室有人在唱英文歌。
I heard someone enter the room and I did not look up to see who it was. 我听见 有人进屋，我没有抬头看是谁。
第二个句子,先找出句子的谓语.即为:was found.可以看出次句谓语是个动词短语.所以该句不能出现其他动词再做谓语了.故,第一个空为ving形式作后置定语,修饰THE BOY,不做谓语.第二个空显然也不能为谓语.此时,你需要了解find的用法:
find sb doing sth意思是发现某人正在做某事。
find sb do sth 意思是发现某人做了某事,已经做完了.
可以看到，句子的尾处有个"yesterday"
这些都是ving在句中的名词后作定语,不做谓语了.
还有的时候句子中带ving ,是因为现在进行时,即:由Be+Ving做句子中的谓语.
有些是没有Be动词,直接是Ving接句子出现在句子开头或结尾,是动词ving形式做状语,表示动作发生的状态
eg:Finding my dog missing,I was very sad.
还有的是因为那些动词或动词词组后就要加ving,为固定搭配.eg:avoid避免 practise练习
risk冒险等
还有要注意区别一下,有的动词即可接Vto,有可接Ving eg:forget, remember等。后接不定式作宾语，表动作尚未发生；后接ving形式作宾语，表动作已经发生。stop to do停下来做另外一件事，to do是目的状语；stop doing停止做、不做当前这件事，doing是宾语。try to do尽力做，try doing试试看；go on to do接着做另外的事，go on doing继续做原来的事。
这一点前面也说了,find 和hear就是这样的
另外Ving还可做名词,在句中做主语或宾语
例如:I want to go shopping today
(shopping做宾语)
Fishing is a intresting game.
(fishing 做主语).
呵呵,我只能表达这么多了,希望楼主可以用得上~
The boy (standing )in the teacher's office was found( smoking) at the school gate yesterday .在这句中第一个是现在分词作定语修饰前一名词the boy,并且和被修饰词之间是主动关系所以用现在分词.后一个也是现在分词作主补,因为这是find sb doing sth 结构的被动形式.doing这个现在分词在这一固定搭配中是一定的.
这里，“我听到某人的喊叫”，强调当时我所听到的一个状态，所以要用ing.
The boy ( standing )in the teacher's office was found( smoking ) at the school gate yesterday (stand)(smoke)
第一个空，是指“站在老师办公室里的男孩”，做状语，所以用ing.
第二个空，和第一题相似，“被发现在吸烟”，强调当时被发现的状态，所以用ing.
水平有限，楼主参考一下把~
standing
smoke
第一和第三关键看句子是否强调正在
第二句stand做the boy 的定语，因为男孩是自己站着，用ing而不用 ed
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