Meiji Festival is an important day in Japanese history.

What is the main clause of this sentence?

What he said is a subordinate clause.

He gave me the cold shoulder.

Just as the phrase 'look before you leap' suggests, he prepared everything in advance.

A healthy diet and moderate exercise help boost immunity.

He is an expert in mechanics.

The Earth maintains its shape due to centrifugal force.

He has a strong ability to get things done to make the project successful.

His imagination is infinite.