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Hi, I couldn't find a thread on this topic (i only looked at the first 3 pages for my search...there are just too many with the key words)

I am having trouble explaining the difference between the two clauses.

It is simple enough for adults to distinguish what is purpose and what is reason or just simply use sentence structure to separate the two. However, the information I am gathering for this topic is for non-native speakers living in Taiwan.

Here is my own thoughts, could anyone tell me if I am wrong.

Purpose: in order to, so (that), in order that

Reason: because, since, as, given(that), considered/considering (that)

In order to stay fit, I go to the gym. (I proactively go toward my goal of staying fit, so I cause the action "go to the gym")

Because I am obese, I (have to) go to the gym. (do I need have to? Or does it only emphasize the meaning: under certain situation/condition, I have to (passively) react to the condition and therefore have to do something?)

So for purpose: I cause the action for the purpose of

and for reason: The reason caused my action

Is this right?
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Don't get stuck on a single example.

purpose =~ goal

reason =~ cause

For infinitives of purpose and infinitives of reason, see What is the meaning of the sentence?

CJ
Comments  
What I am most confused about is that both come down to reason.

Purpose clause: Reason - I want to stay fit - to reach that result/ attain that effect - action is caused by me to go to the gym.

Reason Clause: Reason - I am fat/obese - don't want this condition to persist - I decided to change that by going to the gym.

I find myself in a loop = = I am stuck!
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 CalifJim's reply was promoted to an answer.
Emotion: embarrassed>< Thx

I got it now. Such idiocy on my part...
You make a good point that the first clause to both of these is the CAUSE of the second clauses:

In order to be fit, I go to the gym.

vs.

Because I am obese, I go to the gym.

Therefore the difference isn't that one is a cause and the other is a goal. While I admit only one is a goal, they are both causes. Therefore, the difference is, one is a cause of this type: Goal-step. That is, the first clause is the goal, and the second is a step toward this goal. Whereas the other is of Problem-result type. That is, the Because-clause is always a problem/issue and the main clause is a result of that problem. Another difference is the goal clause's verb will follow the main clause in time (e.g. I must go to the gym many times BEFORE I am fit), whereas the problem clause precedes its main clause in time (e.g. I got to the gym AFTER I am already obese).

I hope that clears it up even more!
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The reason is the "why" that is the cause.

The purpose is the "what for" that is to achieve a result.

I am studying English in order to fulfil the entry requirements for university. (=purpose).
I am studying English because I need it for University. (=reason).

Very difficult to distinguish the difference with these two preceding sentences.

I am doing my homework because my father told me to. (=reason).
I am doing my homework to please my father. (=purpose).

Hope that helps!
Mr. Michael.
THANK YOU!
(So many grammar books, web sites, etc, all useless. Your answer - perfect.)