1. las hermanas
two people.
the two people lean in and share a kiss.
2. ellos
two people.
the two people face away from each other, cross their arms, and frown.
3. gilberto y mercedes
two people.
the two people smile and shake hands.

1. Las hermanas se saludan con un beso.

2. Ellos se cruzan de brazos y fruncen el ceño.

3. Gilberto y Mercedes sonrien y se saludan dandose la mano.

Explanation:

1) the sisters greet each other with a kiss.

2) They, the two people, cross their arms and frown.

3) Gilberto and Mercedes smile and greet each other shaking hands.