What's the difference about "es" and "est" ?
"Es" is only used when the subject is tu. "Est" is only used when the subject is eithe il, Elle or on. They both mean to be.
I remember learning the different possible endings for the 3 singular personal pronouns back in middle school and it helped a lot to make sure I didn't do a terrible mistake with the conjugation. Here they are :
Je (1st person singular) : S-E-X-AI
Tu (2nd person singular) : S-E (Really easy : the e is ONLY possible with verbs from the first group [ending in -er in the infinitive] conjugated in the imperative tense [when giving orders, without the pronoun written : "Mange tes carottes", "Aime ton prochain"], that's it. NOWHERE else)
Il, elle, on, impersonnal il (as in "il pleut", 3rd person singular) : D-A-T-E
These are valid for ALL tenses even the one you won't ever learn about.
They're conjugations of the verb être. The pronunciation is the same, and they both mean 'to be'.
Tu es. (You are.)
Il est. (He is.)
Elle est. (She is.)
Il manque la troisième forme de la troisième personne du singulier:
On est ( which can be translate by: "it is" or "we are" )
Technically, it should not be used for "we are", it really represent the impersonal meaning (best translated as "one is"). But many natives use it this way in speech, to which many other natives will say, trying to correct them : " « on » exclut la personne qui parle". Which is not exactly accurate either : "on" really mean someone [verb] (in this case is) and it doesn't matter who. So this could perfectly be the one speaking. The one thing to remember is that when you use "on", it's because the subject has absolutely no importance whatsoever.
It's a conjugation. They both mean the same thing, but "es" is used with the word "tu" and "est" is used with "il", "elle", and "Je". BTW, you also missed "êtes" which is used for "vous".
No, "est" is not used with "je".