be careful of后加什么形式的动词

be careful of后加名词类的动词

例句

1、

Be careful of the nettles ─ they sting!

小心给荨麻扎着——荨麻有刺！

2、

The Princess's face went pink she said ，'You must be careful of know.'

公主的脸红了，然后她说：“你得小心迈克尔，你知道……”