[General] lifelong lesson

Which of the following sentences is acceptable or better?

1. Trust is a lesson that I have to learn forever.
2. Trust is the lesson that I have to lern forever.
3. Trust is a lesson that I should learn forever.
4. Trust is the lesson that I should learn forever.

5. Trust is a lifelong lesson which I have to learn.
6. Trust is a lifelong lesson which I should learn.

Ashiuhto said:

Which of the following sentences is acceptable or better?

1. Trust is a lesson that I have to learn forever.
2. Trust is the lesson that I have to learn forever.
3. Trust is a lesson that I should learn forever.
4. Trust is the lesson that I should learn forever.

5. Trust is a lifelong lesson which I have to learn.
6. Trust is a lifelong lesson which I should learn.

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They are all fine.

Ashiuhto said:

Which of the following sentences is acceptable or better?

1. Trust is a lesson that I have to learn forever.
2. Trust is the lesson that I have to lern forever.
3. Trust is a lesson that I should learn forever.
4. Trust is the lesson that I should learn forever.

5. Trust is a lifelong lesson which I have to learn.
6. Trust is a lifelong lesson which I should learn.

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They are all unnatural English.

bhaisahab said:

They are all unnatural English.

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Would you please tell me why these sentences are unnatural English? I just can't see why they are so.
Thanks in advance.

every sentence here is grammaticaly correct

pride1 said:

every sentence here is grammaticaly correct

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Every sentence here is grammatically correct.
Now your sentence is grammatically correct.

pride1 said:

[STRIKE]e[/STRIKE]Every sentence here is grammatically correct.

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Please start your sentences with a capital letter and end with a full stop (period).

As bhaisahab said, they are all unnatural English. Something that you have learnt may stay in your mind for ever, but you do not learn a lesson for ever.

nedira said:

Would you please tell me why these sentences are unnatural English? I just can't see why they are so.
Thanks in advance.

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They are unnatural because no native English speaker would say or write them.

I rewrite these sentences as following. Are they acceptable?

1. Trust is a lesson that I have to take forever.
2. Trust is a lesson that I should take forever.

3. Trust is a lifelong lesson which I have to take.
4. Trust is a lifelong lesson which I should take.

The problem with all your sentences is that it is difficult to understand what you are trying to say. It could be anything from "Once you have learnt to trust, you will never forget" to "It takes a lifetime to learn to trust, and you need to work at it all the time".

I rewrite it as following. Is it acceptable?

It takes me a lifetime to learn to trust, and I need to work at it all the time.