Answer:
1. Las mujeres.
2. Unos autobuses.
3. Unos estudiantes.
4. Las comunidades.
5. Unas lecciones.
Step-by-step explanation:
The plural form of the noun in Spanish is formed by adding the suffix -s at the end of the word as in the case of estudiantes. In cases like autobuses, mujeres, comunidades, lecciones you have to add the suffix -es at the end of the word. Another thing you have to take into account is that articles must be pluralized too as in the following examples:
1. La mujer vs las mujeres.
2. Un autobús vs unos autobuses.
3. Un estudiante vs unos estudiantes.
4. La comunidad vs las comunidades.
5. Una lección vs unas lecciones.