This plan is actually impossible to implement.

What is this substance made of?

He was singing to himself alone in the room.

The trolleybus is very convenient as a means of urban transportation.

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

He is not good at expressing his feelings out loud.

Our boarding gate is A7.

He seemed to be singing the song by lip-syncing.

He put himself in a situation as dangerous as jumping into a crocodile's mouth.

Yamatoguchi is a dialect of Nara Prefecture.