英文文法,句子排列問題

這是因為once在這句中是連接詞，其意解”一旦”

Cambridge Dictionary Online就有以下例子Once I've found somewhere to live I'll send you my address.Remember that you won't be able to cancel the contract once you've signed.

There is little chance of taking him once he is there的意思是：

一旦他在那裏，我們就沒有機會與他（另一個人）談話

希望幫到你！

2010-11-17 10:47:06 補充：
對不起，看錯字
There is little chance of taking him once he is there的意思是：

一旦他在那裏，我們就沒有機會帶走他．．．（句子的真正意思，還得看上下文）

"There is little chance of taking him" main clause
"Once he is there" conditional clause
Once = as soon as / if / when

相似例子
There is no need to panic once the money is there in our bank account.