French language Q&A Forum

Hi, why is the subjonctive used here:

et j'espère que tu puisses me pardonner.

the statement is in the affirmative.

Bonjour ! Can you explain me how to use tiret (-) in writing numbers ? Merci ! 

Merci beaucoup!

Cet exercise était amusant et m'a fait rire.  Merci!  

In the above sentence, why is the correct answer "moins d'énergie que" and not "moins d'énergie que de"?  I added the "de" based on this rule: "When expressing there are more/fewer/as many-much [thing/s] than/as [other thing/s], you need to add de after que".  

Can puis be used instead of ensuite. As this was not presented as a correct alternative.

mais 'puis' je me suis réveillé, et ce n'était qu'un rêve !

Question today was "Un jour, on _____ sur Mars."  In a previous   test, "On a ______ opinion."  The previous answer was "On a notre opinion," but today's test was said to be "On ira sur Mars."  How is one to know if the "on" refers to a singular person (on ira) or to several individuals (On a notre opinion)?  It's a bit confusing.  Please clarify.  Thanks.

This exercise only accepts "Je ne sais pas quoi dire" as translation, but I just wanted to confirm that "Je ne sais que dire" is also correct, or is there some difference in meaning between the two that excludes the latter?