sent后面加什么介词

后面加介词to，例如：

1、The blood samples are sent to the laboratory for analysis.血样要送往实验室进行分析。

2、She sent to say that she was coming home.她托人捎话说她要回家了。

3、A UN force has been sent to keep the peace.一支联合国部队被派出维护和平。

sent 后面加介词for，意为“派人去请”。例如：They sent for a doctor at once. 他们马上派人去请医生。