When I was in middle school, I learned that the meaning of 'would' is simply a past tensone of 'will,' and the measning of 'could' is also a past tensone of 'can'.

With this wayexplanation, I have always been inhad trouble to understanding sentences.

I learned new meanings of these words"would" and "could" recently, and now I am practicing sentences using these words for clearer understanding clearly.

It is more natural to say "for clearer understanding," rather than "for understanding clearly."

3. I hope I will go to the restaurant.

It is more natural to use "can" here, like "I hope I can go to the restaurant."

I wish I would go to the restarant.

Same comment as above: "could" is more natural here, like "I wish I could go to the restaurant.

I promised I wouldn't understand like that again.

This sentence is grammatically correct, but I would use more context in the sentence if I said this in real life. What are you promising to not understand again?

4. I haven't checked, but I went to the restaurant.

I haven't checked, but I was able to go to the restaurant.

I haven't checked, but I could go to the restaurant.

6. I thought you could help me.

7. I didn't think I could arrive on time.

I knew I couldn't arrive on time.

When I was in middle school, I learned that the meaning of 'would' is simply athe past tensone of 'will' and the measning of 'could' is also athe past tensone of 'can'.

To me, it sounds more natural to say: “When I was in middle school, I learned that the past tense of ‘will’ is ‘would’ and that the past tense of ‘can’ is ‘could.’ “ However, this is just my preference. The structure you used is not wrong.

WithHaving learned this way, I have always been inhad trouble to understanding sentences.

‘Having trouble’ means that you are struggling with something or that it is difficult for you. ‘Being in trouble’ usually means that you did something wrong and are being punished or chastised. (For instance, if your dog ate your shoe, it would be in trouble.)

I learned new meaning ofs for these words, and now I am practicing sentences using them word for understith their correct meanding clearlys.

I’m not sure what ‘for understanding clearly’ means here, so I changed this to something that sounded right to me. Apologies if I misunderstood.

3. ¶
I hope I will go to the restaurant.

This sentence is grammatically correct.
However, to me it sounds more natural to use ‘can/could’ rather than ‘will/would’ in this sentence and the next sentence.

6. ¶
I thought you could help me.

When I was in middle school, I learned that the meaning of '"would'" is simply athe past tensone of '"will'", and the measing of 'at "could'" is also athe past tensone of '"can'".

With this wayGoing by what I learned, I have always been inhad trouble to understanding sentences (that use "would" and "could").

I think adding more specific information as to which kinds of sentences you have had trouble understanding makes the sentence flow better and feel more complete.

I have learned new meanings of these words, and now I am writing practicinge sentences using the word fos to develop a more clear understanding clearly.

1. ¶
I thought you would have known about that.

I thought this (one) was more expensive.

"One" is not necessary here, but the sentence feels better with it in to me because otherwise, "this" has no clear referent.

3. ¶
I hope I will be able to go to the restaurant. (or, "I hope I can go to the restaurant.")

I wish I wcould go to the restaurant.

I promised I wouldn't understand like that again.

This sentence doesn't make sense to me. What is the Korean version of what you meant to say?

4. ¶
I haven't checked, but I went to the restaurant.

This sentence is grammatically fine, but it feels a bit wrong to me because the first half feels like it is missing information.

I haven't checked, but I was able to go to the restaurant.

Same as with the previous sentence; this feels a bit disjointed just because not enough context is given to properly understand what is going on in the first half.

I haven't checked, but I could go to the restaurant.

I told him I could try my best.

This sentence is grammatically fine, but it needs context to feel completely acceptable.

6. ¶
I thought you could help me.

7. ¶
I didn't think I could arrive on time.

I knew I couldn't arrive on time.