Can you please check these sentences for me? Thank you.

1) Henry believes beauty to be not as superficial as thought.
2) He urges Dorian to enjoy his youth now that he can, while it won't last for ever.
3) He also urges him to give in to any kind of sensations forgetting moral responsiblity.
4) Dorian looks at the painting and recognizes the beauty and the youth in the portrait. He is pained by the thought (idea?) of losing his youth.
5) He can't stand the idea of growing old. He vows that he will if he grows old.
6) I sprained my shoulder and I put a bandage on it. I'll have to keep it on for two weeks.
7) I have high-speed internet connection. There is no need to dial up to the server anymore.
8) Please scroll down the screen so that I can view the information at the bottom of the page. I always need to provide a password and a username.

Change "while" to "because" in #2, and remove the comma.

All others are fine.

1.) after the word "as" write he

2.) Change "while t "because"
3.) "into" is one word.Also, after the word "sensations" write "by"
5.)Don't repeat yourself. It's " He vows that he will if he does."
6.) Instead of "bandage" write "gauze."
7.) Instead, write " There is no need for dial-up" because the reader already knows what that is, unless it's an elementary schooler who is reading this sentence.

Sure, I can check these sentences for you. Here are the corrections and suggestions:

1) Henry believes that beauty is not as superficial as thought.
- The sentence is grammatically correct, but it could be improved by adding "that" before "beauty" to make the sentence clearer.

2) He urges Dorian to enjoy his youth now because it won't last forever.
- The sentence is correct grammatically, but to improve clarity, it would be better to specify the reason why Dorian should enjoy his youth.

3) He also urges him to indulge in any kind of sensations and forget about moral responsibility.
- The sentence is correct, but it could be improved by using "indulge" instead of "give in to" to make it more concise.

4) Dorian looks at the painting and recognizes the beauty and youth depicted in it. He is pained by the idea of losing his own youth.
- The sentence is correct grammatically, but "idea" may be a better word choice than "thought" to make the meaning clearer.

5) He cannot bear the thought of growing old and vows to if he does.
- The sentence is grammatically correct, but "cannot" is generally written as "can't" in informal contexts.

6) I sprained my shoulder, so I put a bandage on it. I'll have to keep it on for two weeks.
- The sentence is correct grammatically, but it could be improved by mentioning that the bandage was applied because of the shoulder sprain.

7) I have a high-speed internet connection. There is no need to dial up to the server anymore.
- The sentence is grammatically correct and doesn't require any changes.

8) Please scroll down the screen so that I can view the information at the bottom of the page. I always need to provide a password and a username.
- The sentence is grammatically correct and doesn't require any changes.

I hope this helps! Let me know if you have any other questions.