問下一d英文時態問題

1. When an accident happened outside the company, I was doing my project.
2. An accident happened outside the company while I was doing my project.

兩個句子意思不同

下面句子的 happened, 不論是 past tense 或 past participle 都是錯
There was an accident happened……

2013-12-13 01:15:11 補充：
TOMING88:
你的三句都是錯
為什麼用 "shall work" 在 past event 上 (yesterday) ?
inversion 不是這樣用, 還有 missing articles
你好像連最基本 tense 都搞亂

I drove to ABC Company to do my project yesterday. (Icombined your two sentences into one because some of the terms are pretty self-explanatory. For example, if you said you drove, then ofcourse it’s by a car. Doesn’t have to berepetitive.) I arrived there at 3:30pm,and there were many people in the company. I then went to Room 206 which is equipped with a lot of computers to getmy project done. There was an accidenthappened while I was doing my project.Basically I rewrote your paragraph by combining some of thesentences together to make it more laconic.

Inversion negation at top of sentence must be used.
Having driven to ABC Co. at 3:30pm, I shall work on my project for 1 hr.
Barely did I have enough time (1 hr.) to finish in Room 206, an accident happened !(31 words.)

'the company' has been repeated many times. You may use pronouns instead. e.g. I went to ABC Company to do my project yesterday. i drove a car and arrived there at 3:30pm.

2013-12-10 16:54:55 補充：
You may also combine some sentences.

e.g.
Yesterday, I drove to ABC company to do my project. When I arrived at 3:30pm, there were many people. I worked for an hour in room 206, in which there were a lot of computers. When I was doing my project, an accident happened outside.

單獨每句來看句式的話 - 除了最後一句放錯when字(即是仍未能寫處境/conditional/因果這種兩連句) - 都不能說錯，但看作是全篇故事或敘事來看則不能說好，因為句子有些要/可以按時序連合，有些內容太零碎，仍有點尾把未完或不完整。

I drove to ABC company and arrived at 3:30pm to work on my project yesterday. I went to Room 206, where many computers were in it, to spend one hour there. There was an accident (what?) happened outside the company when I was there.

Well done. All is correct and in the correct tense form - past tense and past contiuous tense

I went to ABC Company to do my project yesterday. I drove my car to the company and arrived at the company at 3:30pm.

There were many people in the company. Then I went to Room 206 to do my project. There were many computers in the
room. I spent one hour doing my project. When an accident happened outside thecompany, I was doing my project.

The highlighted sentence is to show how we can avoid use I too many times.