Buying Shoes

I wear size forty.

Literally 'I use'. This is a standard, natural way to state your shoe size.

I am size forty.

A very common, short way to give your size to the staff.

Can I try the shoes?

A direct and simple question to ask before putting them on.

Do you have a bigger size?

Uses the formal 'usted' form of the verb 'tener' (to have).

Is there a bigger size?

Using 'hay' (is there) is slightly more direct but very natural.

I need a smaller size.

They are very small.

A fast way to tell the assistant that the shoes feel tight.

The shoes are not comfortable.

A direct way to state that the shoes do not feel good on your feet.

Are there in black?

A short and common way to ask for a different color.

I want these shoes, please.

Adding 'por favor' (please) makes stating your desire polite.

I am taking these shoes.

This is the most common way locals say they are buying an item.