He never tires of

[Maybo]

1. He never tires of (= he enjoys) playing games on his computer.
2. I'm really tired of fish.

I found two sentences in a dictionary. I'd like to know when should I use "tires" and "tired"

 

[emsr2d2]

1. He never tires of (= he enjoys) playing games on his computer.
2. I'm really tired of eating/collecting fish.

I found two sentence in a dictionary. I'd like to know when should I use "tires" and "tired"

I'm not sure quite what you meant by sentence 2 but it wasn't natural as a standalone sentence. As part of a longer dialogue, it might work.

In the first, "tire" is a verb. In the second, it's an adjective. I just want to check you're aware of that. In the first, it doesn't so much mean "he enjoys" as "he never gets bored of".

We tend to use "to tire of" as it's used in sentence #1 - to express a general/habitual action/fact, and to refer to the future "I will never tire of looking into your deep green eyes".
Use "tired of" to mean "bored of" or "fed up with":
I'm tired of your b*llsh*t.
She's tired of the constant complaining.
By the end of the week, you're going to be really tired of staring at that computer screen.

 

[Maybo]

Use "tired of" to mean "bored of" or "fed up with":
I'm tired of your b*llsh*t.
She's tired of the constant complaining.
By the end of the week, you're going to be really tired of staring at that computer screen.

"Tired of" seems to be used in a specific event or situation.

 

[BobK]

I don't really see the problem: 'tired of'/'never tires of' are two ends of the same continuum:

'He never tires of eating fish' - he wouldn't mind if the canteen served it every day
'He's tired of fish' - The canteen serves it every day; he says 'Oh no, not fish again'

Specificity doesn't (specifically!) come into it, except that it's hard to be tired of something non-specific.

 

[Maybo]

two ends of the same continuum

I don't understand that.

So, do you mean they are the same? Are they interchangeable in any situation?

1. He tires of eating fish.
2. He is tired of eating fish.

 

[Tarheel]

1. He never tires of (= he enjoys) playing games on his computer.
2. I'm really tired of fish.

I found THE/THOSE two sentences in a dictionary. I'd like to know when should I use "tires" and "tired"

 

[Tarheel]

I don't understand that.

So, do you mean they are the same? Are they interchangeable in any situation?

1. He tires of eating fish.
2. He is tired of eating fish.

Both are possible. However, a simple dialogue doesn't readily come to mind for the first one. In fact, the second one is phrased differently than how most people would say it. (See below.)

I've had fish every day this week. I'm tired of fish.

 

[emsr2d2]

The main difference, as you can see from all the examples given here, is that "never tire of" is used with positive experiences and "tired of" is used with negative ones. You can't call them interchangeable. If that were the case, you'd be able to leave the entire surrounding sentence in its original form and just swap "tires" for "tired". That won't work.

 

[Maybo]

If I say “Mary tires of food business and she is going to sell her company", should I use "tires of" or "is tired of" in this sentence?

 

[Tarheel]

If I say “Mary tires of THE food business and she is going to sell her company", should I use "tires of" or "is tired of" in this sentence?

The phrase "tires of" is not even close to being right. You might say, "She's tired of the food business and wants to do something else." (Maybe retire. ) Or something like that.

 

[Tarheel]

@Maybo Did you notice the pun?

 

[Maybo]

@Maybo Did you notice the pun?

Where?

 

[Tarheel]

Where?

"Tires of", "tired of " and "retire".