A cold day.

It was cold day today. Without any heaters in my house, I have to wear a jacket .
I was going to do walking but changed to do running because I can't stand this temperature.

If the low pressure system is located east of Japan and the high pressure system is located on China, they are called the pressure system formation in winter and the weather becomes cold. 

I want it to be getting warm.

I'm absolutely sure

I learned how to say things with confidence.

I'm (absolutely | 100% | pretty | fairly ) ( certain | sure ) ...

Other phrases to show confidence:

• probably (50% - 60%)
• maybe
• perhaps (50%)

Could, might and may are also used to show confidence:

• could (have | be)
• might (have | be)
• may (have | be)

All of a sudden

I learned phrases following:

• When all of a sudden the building began to shake, some of people screamed.
• We got out just as the building was about to fall down.

I found an interesting video clip when to search "a goner."