有關英文句子文法的問題

完全正確,

past tense 都系用系過去的句子

若然你想突出某一過去時段所作的事,可寫作如下(例子)

When a cup was broken, l started to clear the floor

2014-01-16 21:43:57 補充：
When a cup was breaking, l started to clear the floor先岩

I participated in a activity last Friday. I did many things in the actvity.
I participated in an activity last Friday and did many things there.

“…. You should be learnt to write …. “ ~ written by TOMING88
~ passive voice? It is a glaring mistake.

“learned” can be used as an adjective before a noun, but not “learnt”.
~ a learned professor

As a 知識網回答者, we should learn to write responsibly, not churning out gibberish.

" was(were)" and the present participle is used to express an action going on during a certain time in the past;
It is often used to indicate an action was going on (background) at a time when something else (foreground) happened.The new action is expressed by the simple past tense;which you should be learnt to write,eg:-
As I was participating in a (game) activity last Friday, I was involved in many things.
As I was participating in an activity last Friday, I did(=took part in) many things.
(in the activity)should not be repeated.

an activity