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I've been having some confusion regarding to the usage of these two words. When do i use know or knew? Does it mean that when i use "knew" it indicates that i do know that particular thing at that point of time but not now? Below i include some examples for your understanding of my confusion.

Example : 1. I know him since primary school.

2. I knew him since primary school.

Example : 3. I knew what he was going to do but i didn't report it to the authorities.

4. I know what he was going to do but i didn't report it to the authorities.

Which sentences are correct? Can you please interpret the meaning of each question if all are correct.
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These are correct:

1. I have known him since primary school.

3. I knew what he was going to do but i didn't report it to the authorities.-- He did it

4. I know what he was going to do but i didn't report it to the authorities.-- He hasn't done it yet.
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1. I've known him since primary school, but I can't help him at the present time. Present context.

2. I knew him since primary school, but I couldn't help him then, it was impossible. Past time.
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Mister MicawberThese are correct:1. I have known him since primary school.3. I knew what he was going to do but i didn't report it to the authorities.-- He did it4. I know what he was going to do but i didn't report it to the authorities.-- He hasn't done it yet.
Hi, im a Chinese and im really confused with the sentences which started with present tense and then ended with past tense. So can you expand more on number 4 and give me more examples about it?
Students: Are you brave enough to let our tutors analyse your pronunciation?

ok. but let's say professor X meets his first student and wants to evaluate him ...

which is correct?

Logan, when asked what he knows

or

Logan, when asked what he knew


inclining for the latter

Which one is correct?

The bayo I knew

The bayo I know

anonymousExample : 3. I knew what he was going to do but i didn't report it to the authorities.
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It all started by saying Hello. In the 50plus club chatroom with strangers and some friends I know.

paint navy 328

It all started by saying "Hello" in the 50plus club chatroom with strangers and some friends I know.

This all goes in the same sentence, not in two. "I know" is OK here.

CJ

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