Hello, Ben! Here are your corrections for today...

    *********CORRECTED SENTENCES OF BEN KIM************

1. I used to think playing the guitar is easy.
2. My brother's loud voice gets on my nerves.
3. If there is a bad happening, a witness is really important position.
4. I don't want to make my homework pending.
5. My finger flesh (pad)  got hurt by my mistake, but now it's healed.

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BEN: I used to think palying the guitar is easy.
CORRECT: I used to think playing the guitar is easy.

EXPLANATION:

Be careful with your spelling. Recheck your composition before sending. ^^
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BEN: My brother get on my nerves with his loud voice.
CORRECT: My brother's loud voice gets on my nerves.

EXPLANATION:

Please practice the proper order of words in a sentence. Your sentence is quite indirect so to make it simple, we need to arrange your words into it's appropriate placement. Try using the possessive form by utilizing apostrophe then -s <'s>
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BEN: If there is a bad happening, witness is really important position.
CORRECT:  If there is a bad happening, a witness is really important position.

EXPLANATION:

a. Always remember, Ben, whenever the noun is countable, please use the article "a."

b. No need to put the word POSITION at the end because your sentence is already complete without it. Too much unnecessary words should be avoided.
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BEN: I don't want to make pending homework.
CORRECT: I don't want to make my homework pending.

EXPLANATION:

Word order again, Ben. The sentence will make sense if you will put the adjective PENDING at the end. This means that you don't want to let your homework to be pending.
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BEN: My finger flesh was hurted by my mistake, but now is safe.
CORRECT: My finger flesh (pad)  got hurt by my mistake, but now it's healed.

EXPLANATION:

a. It is better to use the words FINGER PAD in this sentence. It is the fleshy underside of the end of the finger.

b. Instead of using WAS HURT, please use GOT HURT to mean that you obtained this feeling.

c. Ben! The past tense of HURT is also HURT. ^^

d. Ben, when you say that your finger pad is SAFE now, it means that it was DANGEROUS before. ^^ Let us use another adjective like HEALED instead.

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Thank you, Ben, for trying your best to make a good sentence. I can see your effort. Please study about the corrections that we have here.

Oh, thank you with the link as well. Haha.

Have a relaxing Friday and a fantastic weekend!

Always here,

Teacher Ace~