求助(英语)

有的。
澳大利亚是国家，前面不可以加定冠词。

既然是每天想就不用用进行时吧,而且是她先去你才想的，所以从句的时态应该比主句前吧！我的意见是：
I missed you everyday since you have gone to Austrilia.

I have been missing you since you went to Austrilia.

have been doing本来就是一直的意思，就没必要加“每天”了，还有Austrilia前不用加the

I miss you.更直接、更简洁

应该是everyday