He measured the humidity using a psychrometer.

He is wearing a new wristwatch.

I soak my toothbrush in mouthwash every night.

Watching a movie alone is enjoyable.

I went to see a movie by myself.

His effort is exactly like the proverb 'Even a fool can move a mountain.'

Gender identity refers to the gender that each individual recognizes themselves as.

The government declared a state of emergency to prevent the spread of the new coronavirus.

That person is my friend.

There are 20 students in our class.