1. Cantant et rident. 

"They sing and laugh."

2. Non scribo, sed lego.
"I don't write, but read."

3. Non modo bene cantant, sed etiam bene saltant.
"They not only sing well, but also dance well". 

4. Neque legis neque scribis.
"You neither read nor write." 

5. Vel laborant vel ludunt.
"They (either) work or play."

6. Non taces, neque fles.
"You are not silent, and neither do you cry."

7. Quis cantat et qui rident?
"Who is singing and who are laughing?

8.Ridere non licet.
"It's not allowed for you/her/someone/etc. to laugh."

9.Cur non dormitis?
"Why don't you sleep?" (pl)

10.Quando canitis? Hodie non canimus.
"When do you sing? Today we don't sing." 

Seifer's comments are, in general, good. But maybe one can add the following:

1. When translating Latin to English, there are several possibilities for the present indicative:

So "scribo" may be translated either as "I write", or "I am writing", or "I do write".

This is important, for in English conversations one would not reply "I write" or "I do write" to the question "What are you doing?". One would rather say "I am writing". Therefore, one must devolop some sensitivity in regard to which English translation one should use.

So, for example:

     Quid facis? Scribo.

     What are you doing?  I am writing.

2. Seifer has corrected sentence number 7 by adding the pronoun "qui". That's one way of doing it. But another way of doing it is to simply adjust the spelling of the verb "rideo": from the 3p plural "rident" to the 3p singular "ridet". That way one can keep the original translation provided by Nao (i.e. "Who sings and laughs?").

Best wishes!

Bosse