eng make sentences

1. after
i) I will have dinner after 7:30pm.
ii) I usually watch TV after doing homework.

2. before
i) My mom will come back before 6pm.
ii) Before 11pm, I often watch TV.

3. when
i) When I look through the window, I see the children is playing.
ii) When he starts to play the piano, his mom asks him to lend a hand.

4. while
i) The door bell rings while I am watching TV.
ii) While we are playing outside, it rains.

2013-06-03 16:10:22 補充：
如002所說,, 要注意when 和 while的分別。
when 是指某一刻的事情 ，而 while 則是指發生了一段時間的事情。

2013-06-07 17:50:41 補充：
5. during
i) During Christmas, people will have delicious meals and hang out with friends.
ii) We can go out and play during the weather is good.
iii) During Mid-Autumn festival, we will eat moon cakes and play with fluorescence sticks.

When will be the best time for me to come over? I was interviewing a probationer when the fire alarm went off. I will participate in the extra-curricular activities after I finish all of my homework. We had to evacuate the building while I was performing computer maintenance at my desk. He was feeling unwell during the entire training session.

嘗試用看電影的情景作了幾句，希望帶出一些分別：

When the movie started, I was queuing to buy myself some popcorn.
I was queuing to buy myself some popcorn when the movie started.

After I bought myself some popcorn, I rushed to my seat in the theatre.
I rushed to my seat in the theatre after I bought myself some popcorn.

Before the movie ended, I managed to get to my seat.
I managed to get to my seat before the movie ended.

While I was watching the movie, I was eating popcorn. （SVO 句：I was watching the movie）
While watching the movie, I was eating popcorn.（phrase：watching the movie）
I was eating popcorn while I was watching the movie.
I was eating popcorn while watching the movie.

During the whole movie, I enjoyed much
I enjoyed much during the whole movie.


注意
可以把放在前面或後面，看你喜歡哪個。

when 是指某一刻的事情 （the movie started），而 while 則是指發生了一段時間的事情（watching the movie）。

while 後面可以是 SVO 句 或 phrase， 但 during 後面一定是 phrase 而非 SVO 句。


希望幫到你！

2013-06-03 01:33:11 補充：
打漏了：
可以把 **when/after/before/while/during** 放在前面或後面，如上所示，看你喜歡哪個。

when:
I was doing homework when Tom called me.

after:
After the examination, I hang out with my friends.

before:
I finished my homework before six o'clock.

while:
I was playing computer games while mum was cooking dinner.


hope can help u :)