هام قبل ان يقع طلابكم فى الخطأ

[mr.hisham abo mohamed]

What about these sentences
Waiting for John ,the kettle boiled
Pressing the button ,the lift moved to the fourth floor
The subject in these two sentences is not the same

[mahrousahmed]

المشاركة الأصلية كتبت بواسطة mr.hisham abo mohamed

What about these sentences
Waiting for John ,the kettle boiled
Pressing the button ,the lift moved to the fourth floor
The subject in these two sentences is not the same

Sure they are correct but I am talking about the cases mentioned in our school books but.....

The first sentence mainly was: While I was waiting for John , the kettle boiled. Here we are talking about a continuous action in the past and a simple one.
In the second sentence We pressed the button of the lift so I think the subject is the same. The sentence mainly was
When I pressed the button (of the lift) , the lift (it) moved to.....