bonjour a toute et a tous pouvez vous m'aider svp merci beaucoup

Bonjour

1- This spider has attacked 65 people since 1987.
     .............. ..has been attacking....................

2- The box jelly has stung 64 people since my sister was born.

3- There have been 7 deaths since they  allowed swimming in this area.
     
4- I haven't seen a shark since I stopped surfing.
    

5- That dog hasn't bitten anyone since I bit hime.
  ou/ That dog hasn't been bitten anyone since I bit him.

(to bite/bit/bitten)

en général = present perfect - since - preterit 

je ne connais pas vos exos précédent mais ou tu mets present perfect simple
ou present perfect continous = have + been + participe present (je le rajoute en-dessous chaque phrase là où ça me semble possible. Choisis en fonction de tes cours....

bonne nuit/journée :)