The flow of the river washed away the sand on the shore.

He chose to leave.

He succeeded in effacing his past failures.

The decision of his going and staying is left to him.

Believing that failure is a stepping stone to success, he challenged again.

Believing that failure leads to success, he continued to challenge himself over and over again.

He likes to take a walk in the park at dusk.

The four tones of Chinese, namely ping, shang, qu, and ru, I particularly find the rising tone (jōshō) difficult.

We should always remember the power of Kannon in difficult times.

After he left, she remembered the proverb 'feelings for a departed one grow weaker over time'.