简单的英语翻译句子

1.Please keep silent. The meeting will begin soon.
2.First I didn't know what to do, later I didn't know how to do.
3.Don't walk in the rain, or you'll catch a cold.

Please be quiet,the meeting is going to start now.
I didn't know what to do,later ,I didn't know how to do with it.
Don't walk in the rain,or you will get a cold.

Silent, the meeting commences now.
I don't know what to do, I don't know how to do later either.
Don't walk in the rain, or you will get a cold.