1

What proper words should I use in the following:

1) A teacher tells his students

I am going to take a glass of water. Keep quiet, I should not hear any noise

this is the part of the sentence where I don't know which proper words to use

2) Should I use costly or costy in the following:

Gold is a costy/costly metal.

3) If some one want to go up to the roof of the house what should he say

I want to climb the roof

or something else.

  • 2
    Welcome to ELL! We prefer to have just one question per post. I suggest you boldface the part of #1 which puzzles you, and delete #2 and #3 here. If you consult a dictionary you will find there is no word costy in ordinary use, so #2 would be closed; #3 may be posted as a separate question. – StoneyB on hiatus Mar 6 '16 at 12:25
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In (1),

I am going to take a glass of water. Keep quiet, I should not hear any noise

"Keep quiet" and "I should not hear any noise" are both independent clauses. They should be either separated by a semicolon or separated into two sentences. To add clarity, "take" should be changed to "drink" if that is the action being performed. Furthermore, "should not" should be changed to "do not want to". The correct sentences would be

I am going to drink a glass of water. Keep quiet; I do not want to hear any noise.

Even better, you could relate the two sentences:

While I drink a glass of water, keep quiet; I do not want to hear any noise.

In (2),

Gold is a costy/costly metal.

As StoneyB pointed out, costy is not in the dictionary.

Edit:

In (3),

I want to climb the roof

is more descriptive when written as:

I want to climb up the roof.

  • 1
    (3) as stated by OP is weird. It should be something like "I want to climb onto the roof" or "I want to climb up on the roof." – MaxW Mar 6 '16 at 22:48

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