Contractions in Spanish and English are very different, because English contractions, such as it is > it’s, are considered somewhat informal and are optional. In Spanish, however, contractions are required.
There are essentially 3 types of Spanish contractions.
1. A and de plus definite article
The prepositions a and de contract with the masculine singular definite article el. They do not contract with the feminine la or the plurals los and las.
|a + el||al|
|a + la, a + los, a + las||a la, a los, a las|
|de + el||del|
|de + la, de + los, de + las||de la, de los, de las|
2. Con plus prepositional pronoun
The preposition con contracts with the prepositional pronouns mí, ti, and sí, and the suffix –go is added to each one.
|con + mí||conmigo|
|con + ti||contigo|
|con + sí||consigo|
3. Verbs plus object pronouns
When object pronouns follow certain verb forms, they all contract into a single word, and accents may need to be added to maintain proper word stress.
|ver + lo||verlo|
|mostrar + me + la||mostrármela|
|ayuda + me||ayúdame|
|vaya + se||váyase|
|haciendo + lo||haciéndolo|
|hablando + te||hablándote|
Learn more: Object pronoun placement