Mobile phones have become indispensable in our lives.

He had his coins exchanged.

Could you attend the meeting on my behalf?

He is playing the character of Hatsu.

He was a very excellent student before he turned to delinquency.

His words are always sweet on the surface but venomous underneath.

His words reminded me of the proverb 'good advice may be uncomfortable to hear.'

He finished all the work alone.

I went to the gym every day for one month.

He decided to make a name for himself by starting his own company.