①All of us are students from English.(改为否定句）----- ----- ----

①All of us are students from English.(改为否定句( none )( of )( us )( is )a student from English②I was a middle school student last year.(改为同义句) I ( wasn't )a middle school student ( before )last year.③The light takes many years to reach the earth.(对many years提问）
( how long does )the light ( take )to reach the earth?④They had a wonderful time in the science museum(改为同义句) They( enjoyed )( themselves )in the science museum.

1,none of us is
2.wasn't until
3how long does take
4enjoy themselves

1. None of us is
2. am, since
3. How long does, take
4. enjoyed themselves

1 none of us is 2 wasn't until 3 How long does take 4 enjoyed themselves

②I --wasn't-a middle school student
-until- last year.
③The light takes many years to reach the earth.(对many years提问）
-How-- -long- -does-- the light -take- to reach the earth? ...