during
the lesson.
You use
when
to show that one thing happens right after
another.
She opened her presents
when
she woke up.
He turned on his computer
when
he got home.
You use
while
to show that one thing happens at the
same time as another thing.
He usually does his homework
while
he watches TV.
She borrowed my car
while
l
was
on holiday.
You can also begin a sentence with
when, while, before,
after.
Grammarguide
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