when 和 while引导的从句可不可以用现在进行时？

when引导的时间状语从句是怎样的？

时间状语从句: 连接时间状语从句的连接词有: (1) 连词：when, while, as。 它们都表示当…时候的意思。如果主句和从句的动作同时发生且都是进行时 态，只用while, as。 其他情况下when, while, as通用。 1 When he came in, I was listening to the radio． 2 As I was wandering in the street, I met her。 3 While (as) I was watching TV, my mum was cooking in the kitchen。 (2) 连词befor...全部

  时间状语从句: 连接时间状语从句的连接词有: (1) 连词：when, while, as。 它们都表示当…时候的意思。如果主句和从句的动作同时发生且都是进行时 态，只用while, as。
   其他情况下when, while, as通用。 1 When he came in, I was listening to the radio． 2 As I was wandering in the street, I met her。
   3 While (as) I was watching TV, my mum was cooking in the kitchen。 (2) 连词before, after, since, until(till)。
   当他们表示时间时，他们既是介词又是连词。 { He usually drinks a cup of tea before he goes to school。 连词 He usually drinks a cup of tea before going to school。
   介词 { He usually drinks a cup of coffee after he comes back from school。 连词 He usually drinks a cup of coffee after coming back from school。
   介词 { I have lived in Dalian since my son was born in 1999。 连词 通常情况下，主句用现在完成时，从句用一般过去时。 I have lived in Dalian since 1999。
   介词 { I will wait here until(till) you finish your job。 连词 I will wait here until(till) 8pm。
   介词 (3) 词组：as soon as { I will tell him as soon as he comes back。 As soon as she finishes her homework, she will play tennis。
   通常情况下，主句用一般将来时，as soon as 引导的从句用一般现在时。收起