to have uncertainty regarding something
avoir de l'incertitude concernant quelque chose (avoir de l'incertitude concernant quelque chose)
"I have serious doubts about his honesty."
"J'ai de sérieuses doutes sur son honnêteté." (j'ai de sérieuses doutes sur son honnêteté)
to prepare an official document or agreement
to join a conversation by adding your opinion or comment
to pay attention or listen carefully
to recover quickly after a setback or failure
to do something with great enthusiasm or energy
to have no more time to complete something