Bonjour
LE PRESENT PERFECT
have (au présent > have/has) + participe passé du verbe
a- I have volunteered in Africa to get some experience.
b- You have taken part to the employee club as a secretary.
c- Have you ever checked your email to confirm your application ?
d- Oh so, you've already tried to contact the boss !!
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Bonne soirée ☺☺☺