我想問幾題英文要加so,when,because

1.Uncle Sam was visiting us,so we took him to Ocean Park.
2.I didn't touch the dolphins,because I was afraid.
3.When we were watching the dolphins, it started to rain.
4.We didn’t have umbrellas,so we were all wet.
5.When we saw a car accident,we were waiting for a taxi.

1. Uncle Sam was visiting us so we took him to Ocean Park.
2. I didn't touch the dolphins because I was afraid.
3. When we were watching the dolphins, it started to rain.
4. We didn't have umbrellas so we were all wet.
5. We saw a car accident when we were waiting for a taxi.

2007-11-30 18:36:12 補充：
To: hochunyuPlease note your no. 5 is wrong.We saw a car accident when we were waiting for a taxi. [this is better]

2007-11-30 18:50:55 補充：
We usually do not need to put a comma if the main clause is put in front of the subordinate clause, therefore it is not necessary to put a comma in front of the word [because].