as soon as引導條件狀語從句
例句
1、
As soon as relations improve they will be allowed to go
一旦關係有所改善，他們就可以獲准離開。
2、
As soon as the necessity for action is over the troops must be withdrawn
一旦軍事行動的必要性不復存在，軍隊就必須撤出。
例句： He’ll send us a message as soon as he arrives in Sichuan.
他一到四川就給我們發資訊
as soon as表示“一…就”引導的是時間狀語從句，其用法是主句用將來時，從句用一般現在時，故用arrives。
例句：
He will give a hands soon as someone asks for help．一有人求助，他就會伸出援手
用as soon as引導的條件狀語從句，遵循主將從現的規則，從句主語someone，謂語動詞用單數，ask for help求助，故答案是as soon as someone asks for．
as soon as 的用法一般是兩種情況：
1、指未發生的動作，規律是：主句一般將來時，從句用一般現在時代替一般將來時
如：I will tell him the news as soon as he comes back．
有時，爲了特意表達剛剛完成某事就如何如何，需要用現在完成時．
如：I will go with you as soon as I have washed my face．
2、指緊接着發生的兩個短動作，主從句都用一般過去時
如 ：He took out his English books as soon as he sat down
這樣的例句如下：I will give my daughter an apple to eat as soon as she comes back from school .
