我本想劝劝她。

I had wanted to persuade her otherwise.

我劝你多加小心。

I advise you to be more careful.

我劝你把烟戒掉。

I advise you to quit smoking.

我劝他不要往那儿去。

I urged him not to go there.

我劝过他不要走这一步。

I urged him not to take that step.

怎么也劝不动她

unable to persuade her otherwise

大家劝了好久，还是没有把他劝过来。

Although everybody spent a long time trying, they were unable to persuade him otherwise.

惩恶而劝善

punish evil and encourage people to do good