The present progressive tense in Spanish is formed by using the verb 'estar' followed by the gerund of the main verb. The structure is: 'estar + ing + verb + -ando/-iendo'. This tense is used to express actions that are happening right now or habits. Here are some examples:
1. Estoy leyendo un libro. (I am reading a book.)
2. Está comiendo. (He/she is eating.)
3. Estamos trabajando en un proyecto. (We are working on a project.)
Remember that the subject pronoun is not usually used in the present progressive tense in Spanish. However, it can be used for emphasis or to avoid ambiguity. For example:
Yo estoy trabajando en un proyecto. (I am working on a project.)
Keep practicing, and you'll get better at using the present progressive tense in Spanish.