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i feel like want to cry making my report..i'm confusing of using those words..
which one is correct?

1.The pedestrian link design was changed due to column is/was located in the road median
2.The pedestrian link has been changed due to column is/was located in the road median

1. The beam was constructed with size 600mm
2. The beam has been constructed with size 600mm
or can I just use
3. The beam constructed with size 600mm

when to use is changed, was changed and has been changed?
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Comments  (Page 2) 

The disposition of Vehicle was changed from manila to rizal

my_e11evenIt sounds that was changed/was move+ed and has been changed/has been mov____+ed have similar meanings..isn't it?
and 1 of my friend told me that 'has been _finish___+ed' is something that always happen. for example 'has been constructed' means from past until today, the construction still not finish..is it true?
Students: Are you brave enough to let our tutors analyse your pronunciation?

It is true.was changed is past event that is not present.

Has been V3 is present perfect that means accomplished something.

Has been Ving is progressive term that happen until now.