In Spanish, you can combine two object pronouns in one sentence to say who receives something, and what they receive. This is very common in conversation and makes you sound much more natural. For example, instead of saying 'I give the book to you', you can simply say 'I give it to you'.

The order is always the same: the indirect object pronoun, which tells you 'to whom' or 'for whom', comes first. Then comes the direct object pronoun, which is 'what'. For example, 'Te lo doy' means 'I give it to you'.

Now for the most important rule. When the indirect pronouns 'le' or 'les' come before the direct pronouns 'lo', 'la', 'los', or 'las', they change. To avoid the clashing sound of two 'L' pronouns together, 'le' and 'les' both become 'se'.