shudder and shaky???

Sorry that I have to tell you that all the sentences are called Chin-glish. That is Chinese English.

If you want me to help you, all these sentences have to be re-written.

1. Do you mean your hands shake for 20 mins or your assignment takes 20 mins to finish?

I just guess:

After I have finished my first assignment, my hands keep shaking for 20 mins.

2. This sentence has no meaning at all.

(I was so nervous that) while I was writing my first assignment, my hands were shaking all the time.

Shudder is a sudden shake that cannot be used here. Such as you feel cold and you shudder.

3. I went to the blackboard with my shaking hands.

4. Your body trembled in front of the class and your mouth was uttering with words.

Check if you understand before you submit your work.

當我要在眾同學面前寫我的字,我身體不期然抖震著
My (uncontrollable )body was shivering while I was writing on the blackboard in front of my class.
我手震震完成第一次測驗
I finished my first term test with my (uncontrollable ) trembling hands throughout.

001 excellent comments and advice.

Commendable!

有d唔明你嘅問題... 但list咗幾個句子... 睇係唔係你想表達嘅意思...

I was so nervous when I did my first test. My hands were trembling throughout the whole
test.

My hands trembled as I wrote on the blackboard.

My fear sent shudders down my spine which caused me to shiver as I wrote my answers on the blackboard.