I know words and phrases but would be lost in a hurry in conversation with a native speaker. It's a beautiful language to listen to.

The required phrases for any non-native Spanish speaker traveling Spain:

Más despacio, por favor.

Also, Andy learned this one from his navy days:

Dos cervezas, por favor. Mi amigo paga.

And I find this one indispensible when Andy and I are traveling Spain:

Mi marido paga.