To make comparisons of equality using adjectives and adverbs we use the formula:

tan + adjective + como
or
tan + adverb + como
and
tantos(as) + noun + como
tanto(a) + noun + como

When using an adjective you need to be sure it agrees with the first noun mentioned.

Examples:

Las niñas son tan juguetonas como los niños.
Girls are as playful as boys.

Los niños son tan juguetones como las niñas.
Boys are as playful as girls.

[ comparisons using adjectives & adverbs ]

To make comparisons of equality using nouns we use the formula:

tanto/tanta/tantos/tantas + noun + como

Tanto agrees with the noun in number and gender:

Ya no tengo tanta energía como antes.
I don't have as much energy as before.

Tienes tantos libros como una biblioteca.
You have as many books as a library (does).

[ comparisons using nouns ]

To make comparisons of equality using verbs we use the formula:

verb + tanto como

Expressions with verbs show no agreement:

Juan trabaja tanto como yo.
Juan Works as much as I do.

[ comparisons using verbs ]