He reached the age of thirty, marking a new milestone in his life.

When the interest rate rises, the amount of loan repayment increases.

He started drafting a new bill.

I am working on drafting a new bill.

She has a spirit of independence.

He started to live independently at the age of 20.

Ritsuo is my best friend.

His words and actions always show an antinomy.

My child goes to a municipal elementary school.

In Japanese grammar, 'independent words' form the main part of the sentence.