高一英語語法慣用法：when習慣上不與現在完成時連用
一、基本用法
when 表示何時什么時候時，可用于現在時、過去時態或將來時態等。如：
When does the train leave? 火車什么時候開?
When did you see her last? 你上次是什么時候見到她的?
When did you arrive in Europe? 你什么時候抵達歐洲的?
When do you think it can be operated on? 你想什么時候可以給它動手術?
When is the contract effective from? 合同什么時候開始生效?
When does she visit you here again? 她什么時候再來這里看望你?
When are you due to visit the dentist next? 你下次什么時候該來看牙醫。
When are you going to get your haircut? 你準備什么時候去理發?
但when通常不用于現在完成時。如：
你什么時候和他首次見面的?
誤：When have you first met him?
正：When did you first meet him?
二、特別注意
但是，since when 可以與現在完成時連用。如：
Since when have you lived here? 你從什么時候起住在這里的?
Since when have you become active? 你什么時候開始變得積極了?
Since when do you read newspapers? 你什么時候開始讀報的?
Since when have you been working here? 從什么時候開始你在這兒工作?
一、基本用法
when 表示何時什么時候時，可用于現在時、過去時態或將來時態等。如：
When does the train leave? 火車什么時候開?
When did you see her last? 你上次是什么時候見到她的?
When did you arrive in Europe? 你什么時候抵達歐洲的?
When do you think it can be operated on? 你想什么時候可以給它動手術?
When is the contract effective from? 合同什么時候開始生效?
When does she visit you here again? 她什么時候再來這里看望你?
When are you due to visit the dentist next? 你下次什么時候該來看牙醫。
When are you going to get your haircut? 你準備什么時候去理發?
但when通常不用于現在完成時。如：
你什么時候和他首次見面的?
誤：When have you first met him?
正：When did you first meet him?
二、特別注意
但是，since when 可以與現在完成時連用。如：
Since when have you lived here? 你從什么時候起住在這里的?
Since when have you become active? 你什么時候開始變得積極了?
Since when do you read newspapers? 你什么時候開始讀報的?
Since when have you been working here? 從什么時候開始你在這兒工作?
