I agree with Peachey. "I forgot drinking my coffee" is not correct. However, I could say, "I don't remember drinking my coffee." "(Not) remember + verb-ing" works.

This is a very common error, and many of my students find it confusing. "How can I help you?" is question word order. Question word order = (Who/What/Where/When/Why/How) + auxiliary/helping verb + subject + main verb + everything else However, after "I don't know" you use statement word order, not question word order. Statement word order = (Who/What/Where/When/Why/How) + subject + (auxiliary/helping verb) + main verb + everything else Even if it's a question (see below) we use the statement word order. Can you tell me where you live? (NOT Can you tell me where do you live?) But if it's just a question, we say: Where do you live?

It was too cold.

Last week and weekend ware was too  very cold hier  here, so I didn't go anywhere. Week includes the weekend, so I deleted weekend. I would change the first part to It was very cold here last week, so....   Too + adjective + to do something --> It was too cold to go anywhere.
I've never been such a so cold. , because the The temperature everymorning was less minus four degrees every morning. Such + noun (such a cold day); so + adjective (so cold) Is this Fahrenheit? That's cold!
Our water of on the balcony has was frozen until about 10 o'clock a.m.

Anyway, I was almost at home every day, so I learned studied everyday German and English.
I've been challenging to translate working on translating a book from English to German. If you want to use challenge, you could say I've taken on the challenge of translating a book.
It's difficult for me, but many people helped help me. You could also say many people have been helping me.
Thank you for  to everyone. 

Could you please check my writing and make it more natural sounding? Thank you.

There's no difference. You can say it either way.

The most important what? There needs to be something before this sentence to know what we're talking about. Among the many festivals/holidays in China,Chinese people regard the Spring Festival (to be) the most important. Or you could add the noun (festival/holiday) after "important." Chinese people regard the Spring Festival (to be) the most important festival/holiday.

365 Questions (Challenge) ++++January 2nd+++        2nd = second

What are you most grateful for?

For my family. They are a great loving people with the courage to take on all types of challenges in life.

****IF YOU WANT TO ANSWER THIS QUESTION, FEEL FREE TO DO IT, LET'S LEARN TOGETHER!!!!****

I wasn't sure what you meant by "with the best feeling," so I used "loving." We "take on" challenges.

Your question is a difficult one; there are so many things I'm grateful for. Hmm... I'd say I'm most grateful for life!

We don't say "be on the assumption." You do something "on the assumption" that something is probably true. Example: I acted on the assumption that he was much older than my sister. In this case, I took an action based on my belief that he was much older than my sister. "I assumed he was much older than my sister" simply expresses what the speaker believed was true.

"XXX doesn't agree with me." My husband says this for so many things! He has a sensitive digestive system, so there are many things he can't eat. The second and third sentences are grammatically correct, but they don't have the same meaning as the first sentence. The first sentence means spicy food makes the speaker feel sick. This differs from the third sentence, which talks about spicy food being bad for the speaker's health. Food that has too much sugar or fat can be bad for your health, but it doesn't necessarily make you feel sick. I would say the second and third sentences have the same meaning.