"It is a woman."
Translation:Es ist eine Frau.
Technically yes. Correct me if I am wrong but in English he/she always refer to a person (or at least a living thing). In German it only depends on the gender of the noun it replaces. For example:
The chair is blue -- It is blue.
Der Stuhl ist blau -- Er ist blau.
The girl is blond -- She is blond (could you use it here?)
Das Mädchen ist blond -- Es ist blond.
Most of the time persons are er/sie (Mädchen is an exception), but objects are not exclusively it. That sometimes creates amusement among my naitve-English friends when I personify a chair ;-)
es is kind of a joker pronoun. Quote from http://www.canoo.net/services/OnlineGrammar/InflectionRules/FRegeln-P/Pron-es.html?lang=en:
"The personal pronoun es replaces:
a noun used as subject in a sentence with a predicative (with sein) When it is used with the verb sein and a predicative nominative, es can refer to singular and plural nouns of all three genders. The verb agrees with the predicative, not with es:
Was ist das? Es ist eine moderne Designlampe. (What is that? It is a modern design lamp.)
Drei Männer betreten das Lokal. Es sind Polizisten." (Three men enter the bar. They are policemen.)
You can see it as an answer to the question Was ist das? (What is that?). You don't know what it is, so you can not know what gender the word has. If you already know that you are talking about an apple then you would use er to refer to it.
Es = It Er = He. These are simple translations. No hard and fast rule to it.
ein/eine : both are indefinite forms of 'a'. However, if it is a masculine noun you use 'ein' and if it is a feminine noun you use 'eine'. See?
Example: 1) ein Mann vs. eine Frau. 2) ein Buch
So on and so forth .
Hope that helped?