开始下雪了英语

状语从句用来给主句一个补充的信息，时间啦、地点啦、原因啦等等，它和主句的关系不紧密，去掉后主句仍然完整。例如：As we was going out, it began to snow.主要的意思是it began to snow“天开始下雪了”补充下雪的时间是As we was going out“当我们正要出门的时候”很好理解，对不对？祝你进步！

It starts to snow outside.Mun is cooking.

Harbin has already snowed since October.

Harbin has already began to snow in October.already一般指已经发生的且对现在造成影响的，大多数情况下都用完成时态，现在完成时或者过去完成时。

第一个填的是with,因为with有使用的意思，这个句子是说我昨天晚上用墨水写了封信给我的朋友。第二题用的是when没错，他们的区别有：when，as，while这三个词都可以引出时间状语从句，它们的差别是：when 从句表示某时刻或一段时间，有“当……时”的意思；as 从句表示进展过程，有“随着，一边……一边”的意思；while 只表示一段持续的时间，有“在……的同时”的意思。例如：When he arrived home, it was just nine o'clock.当他到家时，正是九点钟。As he grew older, he became more intelligent.随着他年龄的增长，他变得更有才智了。While she was typing the letter,the telephone rang.当她在用打字机打那封信时，电话响了。

It is starting to snow outside.My mom is cooking.

In October,Harbin has already began to snow

Harbin has already began to snow in October.