It was very hard for me to find your flat. ✬

Please drink the beer before it goes flat. ✬

It used to be thought that the earth was flat. ✬

My bicycle has a flat tire. ✬

I have a flat tire. ✬

I had to push my bicycle because I had a flat tire. ✬

I got a flat tire. ✬

I was flat on my back for a week with a terrible cold. ✬

My bicycle had a flat tire, so I missed the seven o'clock train. ✬

People once believed the world was flat. ✬