suffer加ing用不用双写r

suffer加ing不用双写r，suffering

例句

1、

I hate to see animals suffering.

我不忍心看动物受苦。

2、

His trial revived memories of French suffering during the war

他的受审重新勾起了在战争中受苦受难的法国人民的回忆。

3、

His school work is suffering because of family problems.

由于家庭问题，他的学业日渐退步。