While and When //// Request with modals

While vs. When
Clauses are groups of words which have meaning, but are often not complete sentences. Some clauses begin with the word "when" such as "when she called" or "when it bit me." Other clauses begin with "while" such as "while she was sleeping" and "while he was surfing." When you talk about things in the past, "when" is most often followed by the verb tense Simple Past, whereas "while" is usually followed by Past Continuous. "While" expresses the idea of "during that time." Study the examples below. They have similar meanings, but they emphasize different parts of the sentence.
Examples:
I was studying when she called.
While I was studying, she called.
While + past continuous( was or were +v.ing ) + past simple ( ed ---- irr.v )
While I was studying , She called.

When + past simple ( ed ---- irr.v ) + past continuous( was or were +v.ing )
When she called , I was studying.
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Request with modals:

past
Verb
Can
Could
v.( infinitive )
without any ending
( s—e--- ing )
will
Would
Should
Should
Must
Had to
may
might



الطلب المهذب
Request with modals
الطلب باستخدام الأفعال الناقصة
الموافقة
الرفض
Can you open the door?
Could you close the window?
Would you sit down?
Ok
Sure , no problem( Accept
( Refuse ( Sorry
I'm sorry I cant