英语中什么时候动词开头要加ing或ed，还有什么时候是原型，是开头动词哦 英语句子中开头时的动词什么时候用ing形式 什么时候用原型
\u82f1\u8bed\u4e2d\u4ec0\u4e48\u65f6\u5019\u52a8\u8bcd\u5f00\u5934\u8981\u52a0ing\u6216ed\uff0c\u8fd8\u6709\u4ec0\u4e48\u65f6\u5019\u662f\u539f\u578b\uff0c\u662f\u5f00\u5934\u52a8\u8bcd\u54e6\u3002\u52a0ing:\u5f53\u53e5\u4e2d\u628a\u52a8\u8bcd\u5f53\u540d\u8bcd\u7528\u7684\u65f6\u5019\u3002
Doing exercise is good for you.
\u539f\u578b\uff1a\u7948\u4f7f\u53e5\u7b49\u3002
Open the window,please.
\u7948\u4f7f\u53e5\u7528\u539f\u5f62\uff0c\u4e0d\u662f\u5c31\u7528ing\uff0c\u8868\u76ee\u7684\u53ef\u4ee5\u7528\u52a8\u8bcd\u4e0d\u5b9a\u5f0f
动词加ing或ed放在句子开头，是非谓语动词的用法，表状态或其他。动词原形开头，一般是在祈使句使用。FOR example:SHUT UP!Or I句子的主语为做某件事时，由于动词不能作主语，所以加Ing变为动名词，才可以作主语用，例如
Doing some sports is healthy.
是表示做些运动有益健康
ed是被动,句首好像不可以用这个啊！
如果这个动词作主语，也可以用to do。这时不定式也相当于一个名词。如：
To see is to believe.百闻不如一见。
Not to grasp firmly is not to grasp at all.抓得不紧等于完全没抓
如果是祈使句，用动词原形（其实这是省略了主语you）。如：
Go back to your seat.
Open the window, please.
-ing,-ed做非谓语动词，比如：作主语,例如：Coming
late
made
the
teacher
angry.作状语。例如：Being
ill,he
didn't
come.
祈使句要用动词开头，并且用动词原形。 例如：Sit
down.
动词开头做主语用ing,ed不知道，原型的时候是祈使句
例如：Studying English is interesting.
Stand up
鹅鹅鹅
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绛旓細8.鍔ㄨ瘝涓嶅畾寮弔o涔嬪悗瑕佺敤鍔ㄨ瘝鍘熷舰锛汸lease give me something nice to eat.9.feel, hear, see, watch 绛夋劅瀹樺姩璇嶄箣鍚庤鐢ㄥ姩璇嶅師褰傚鏋滆〃绀鸿繖涓鍔ㄤ綔姝ｅ湪杩涜锛屽氨鐢ㄧ幇鍦ㄥ垎璇嶃係ometimes we can hear a girl sing in the room.I feel my left leg hurting badly.琛ㄧず鐩殑鏃讹紝涓鑸敤涓嶅畾寮 to do寮...
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