this point is hard though it is more grammatical than meaningful
I want to say something.
TO DO is used to show a purpose of a verb or do-ed, and normally but not absolutely, the agent performing the action shown by TO DO is subject of preceding main clause. TO DO shows a future action.
I learn english to go to US.
this model is used to predict weather.
in the first sentence, agent of TO GO is "I". in the second sentence, PREDICT has no agent but refers to general future action.
...
I want to say something.
TO DO is used to show a purpose of a verb or do-ed, and normally but not absolutely, the agent performing the action shown by TO DO is subject of preceding main clause. TO DO shows a future action.
I learn english to go to US.
this model is used to predict weather.
in the first sentence, agent of TO GO is "I". in the second sentence, PREDICT has no agent but refers to general future action.
...
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