I am planning to go to Inner Mongolia, an autonomous region of China, next week.

I have been to Outer Mongolia.

I have been to Chicago.

The Paleogene period was a very important time in the history of the Earth.

I am learning Modern Greek.

He was envious of her success.

He was wrapping the present.

He was plucking flowers in the garden.

I saw a flock of sheep on the top of the mountain.

He was singing to himself alone in the room.