The two most common, and fundamental, verbs in Spanish are "ser" and "estar" - each of which corresponds in a different sense to the English infinitive "to be". Other common and useful verbs in Spanish include tener (to have), ir (to go), dar (to give) and hacer (to do).
As in many languages, some Spanish verbs can have multiple meanings, which must be deciphered according to the context in which they are used. Common examples are querer (to want or to love) and tomar (to take or to drink).
All infinitive verbs in the Spanish language fall into one of three categories based on the letters that appear at the end of the words in their infinitive form: -ar, -er or -ir verbs. Depending on their categorization, infinitive verbs subsequently conjugate in one of several different ways. As in English, the stem of the word (the verb minus its -ar, -er or -ir ending) remains the same in most cases, while the ending is modified to reflect the subject or object of the verb. Unlike English, Spanish places a far greater emphasis on gender and number, meaning that each verb can be conjugated in one of several dozen ways across all tenses.