His hobby is astronomical observation.

I can't keep up with his irregular schedule.

I measured the wind speed using an anemometer.

We hired a professional to survey the new land.

Please send it by express delivery.

We go to church on the Sabbath.

He fractured his medial cuneiform bone.

He stepped wrong and fractured his lateral cuneiform bone.

He is good at pronouncing lateral sounds.

Regular verbs are relatively easy to learn.