thanghnvn Wrote:"to do" can be used to show the intention of the subject
I learn gmat to take mba
when you are dealing with an active construction -- in which the agent of the action is actually written in the sentence -- this kind of construction should, ideally, show the subject's intention.
"to do" can be used to show the intention of not subject.
this thing is burried to keep it from being stolen.
in general, i would restrict this usage to passive constructions (such as the one in this sentence), because the entire point of such constructions is to omit the actual agent of the verb.
in other words, this kind of usage shouldn't be extended to active constructions.
e.g.
the highway was extended 10 miles farther south, to allow commuters from the southern suburbs to travel downtown more quickly--> this is a passive construction. "to allow..." is clearly not the intention of the highway itself -- in context, it's the intention of whoever planned the highway extension -- but, in a passive construction, this kind of usage is ok.
the planning commission voted to extend the highway 10 miles farther south, to allow commuters from the southern suburbs to travel downtown more quickly--> this is an active construction. the modifier implies that "to allow..." was actually the intention of the planning commission; if that's not the case, this sentence is not ok.