Need more information to answer properly.
Is this question is asking when do you use the word "ES" (is) which is a form of the verb "Ser" as opposed to when do you use ESTA (is) which is a form of the verb "Estar"?
If so, there is a simple rule of thumb: If the the word is referring to something that is (or is considered) permanent, then you use the word "ES". If it is something transient, or impermanent, then you use the word "ESTÁ".
An example:
Él es enfermo
Él está enfermo
Both mean translate directly back to "he is sick". However the top one really means the person is ill either mentally or is not a well person, chronically ill. The bottom one means that the person is not feeling well or is just sick now and will bet better.
As with ANY rule of thumb, you have to watch out for the exceptions.
Está muerto (he's dead) seems to break the "permanence" rule. But if you dig deep into the language which is rooted in religion, death is transient. You move on to a life after death, so the impermanent verb is correct.
Es muerto (more properly "eres muerto") is a threat. That means "you're (a) dead (man)."
And then there is the occupation and marital status. In Spanish, those are permanent. Es un carpintero. (He is a carpenter) Es Casado (He is married). Though you can change your vocation and marital status the language considers these permanent. The use of "Está casado" is starting to take root in some areas, but the proper Spanish term would be ES, not Está.
When it comes to mood, if some one is a grumpy person, you would use the permanent state. If some one is just grumpy now and they are generally not that way, then you would use the transient term.
The Spanish word "es" is used as the third person singular form of the verb "ser," which means "to be." It is used to describe or define something in the present tense.
There are 2 verbs in spanish for the English verb 'to be' These are SER and ESTAR and which one you use depends on what you are saying. This website gives a brief summary of when to use SER or when to use ESTAR. http://atschool.eduweb.co.UK/rgshiwyc/school/curric/Spanish/serestar/1.htm So it will either be ESTAR: (él) está or SER: (él) es
Add "s" to the end of a verb (e.g. run -> runs) for third person singular subjects (he, she, it). Add "es" to the end of verbs that end in s, sh, ch, x, or o (e.g. pass -> passes, watch -> watches).
Es-tu (un) étudiant ? (masc.) Es-tu (une) étudiante ? (fem.). We would not usually pronounce the articles un or une. And we would use the word "étudiant" only for someone at university level (use "élève" otherwise).
"El Mundo Es" translates to "The World Is" in English.
Mi blusa es de color rojo, o azul, o verde ... (We don't use the British spelling of colour in Spanish, though.)
you would use -es when a word ends in a -ch like rich or glitch you use the ending -es
Add "s" to the end of a verb (e.g. run -> runs) for third person singular subjects (he, she, it). Add "es" to the end of verbs that end in s, sh, ch, x, or o (e.g. pass -> passes, watch -> watches).
Yes you can use it.
tu es qui ?
Mi primo es atlético. Mi prima es atlética.
The 2011 Lexus ES-350 runs on regular unleaded.
The 2014 Lexus ES-300H runs on regular unleaded.
The 2012 Lexus ES-350 runs on regular unleaded.
The 2014 Lexus ES-350 runs on regular unleaded.
The 2013 Lexus ES-300H runs on regular unleaded.
The 2013 Lexus ES-350 runs on regular unleaded.
"Quien es tu familia" means "who is your family" in Spanish (you do not use "es" in that sentence)