1. -ing形式作宾语补足语
-ing形式作宾语补足语时，宾语与宾语补足语之间在逻辑上是主谓关系。能接-ing形式作补语的有两类动词:
(1)感觉、感官类动词: see, notice, watch, look at, hear, listen to,find, feel, smell等。
He heard the wind blowing outside.他听到外边在刮风。
felt my heart beating faster.我感到我的心跳得更快了。

(2)使役动词:keep, get, leave,have等。
l'm sorry to have kept you waiting for so long.不好意思让你等这么久。
The captain got the soldiers moving toward the front after ashort rest.
休息了片刻之后，上尉让士兵们朝前线行进。