Preposition Use - for / while / during
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FOR
Use 'for' with a period of time to express the duration or 'how long' something has happened:
for three weeks
for many years
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WHILE
: Use 'while' plus a verb form
while I was watching TV
while I lived in New York
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DURING
: Use 'during' with a noun to express 'when' something happens
during class
during my vacation
during the discussion
ونجي للاختبار عشآن تشوفون فهمكم للموضوع :
http://esl.about.com/library/quiz/blgrquiz_prep4.htm
see you around
MzMz