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a; a the; a the; the a; the
have taken place have been taken place took place have been happened
had been were have been has been
may not; unless could not; without never; but for would; besides
a; a a; the the; a the; the
proposed demanded made witnessed
went through; what .went through; that has experienced; that has experienced; what
have taken place have been taken place took place have been happened
to be great significance to be of great significant of great significance great significant
apart from but for except besides
may not; unless could not; without never; but for would; besides
has experienced .experienced experimented has experimented
a; a a; the the; a the; the
will change changed changes has changed
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