This lemon is sour.

We cannot live without oxygen.

He calculated the area of the triangle.

He is good at solving trigonometry problems.

He is good at arithmetic.

A day without seeing her feels like an eternity of waiting impatiently.

I make a sandwich every morning.

I bought a souvenir from Kyoto.

He was able to solve the complex calculation quickly.

The praise for his beautiful painting did not stop.