Existence. l’existence...............
Life....la vie......................
Being [noun]..l’être..........

I was...j’étais/j’ai été.....................
he was..il était/il a été....................
they were..ils/elles étaient/ont été................

I am....je suis.....................
you are...tu es..................
he is...il est......................

they are..ils/elles sont...................
I will be...je serai...................
he will be...il sera................
they will be...ils/elles seront.............

there was..Il y avait [no ‘existence’ word]...............
there will be..Il y aura [ditto].............
it existed Il existait/a existé

Finally ten short sentences. [please put the 'existence' word in brackets]
example; "The girl [is] a student."

The girl is a student...........La fille [est] étudiante .........................................................
The boy is being kind.........Le garçon agit gentiment.....[agit is not an ‘existence’ word, meaning ‘is acting’....Yet more likely: Le garçon [est] gentil.= The boy is kind..............
The building has existed for ten years...Le bâtiment [existe (present tense)] .depuis dix ans.............................................
The girl is running quickly.....La fille court vite..[no ‘existence’ verb]...........
The boy is handsome.....Le garçon [est] beau...........
The man is a doctor L’homme [est] médecin
I believe in the existence of atoms....Je crois à [l’existence] des atomes.......................
Life exists on earth.....La vie [existe].sur la terre..........
I like being a student......J’aime [être] étudiant..............................................................
I enjoy life........J’aime bien la vie = I like/love life..[no ‘existence’ word.................
I feel love for him/her with my whole Being ...Je l’aime de tout mon coeur = I like/love him/her with all my heart..[no ‘existence’ word]...................................