this is old question from old og book.
this is special sentence in which, "to do" is not future action which will be done by the subject of the main clause. this pattern is rare in formal English.
to keep the world in peace, every military actions must be supervised.
"to do" in above pattern dose not refer to any noun, or to subject of the main clause. "to do" refer to a general action, which dose not belong to any noun in the main clause.
in contrast, "to
...
this is special sentence in which, "to do" is not future action which will be done by the subject of the main clause. this pattern is rare in formal English.
to keep the world in peace, every military actions must be supervised.
"to do" in above pattern dose not refer to any noun, or to subject of the main clause. "to do" refer to a general action, which dose not belong to any noun in the main clause.
in contrast, "to
...
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