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do que or que = than

e.g.

O tempo de hoje está mais frio (do) que o de ontem. Weather today is colder than weather yesterday.

The superlative

Use definite article in front of superlative:

Hoje é o dia mais frio do ano. Today is the coldest this year.

Some

exceptions:

bom - melhor good - better

mau - pior bad - worse

grande - maior big - bigger

pequeno - menor small - smaller

Absolutive superlative

Absolutive superlative can be formed two ways:

analytical (muito before the adjective)

synthetical (-íssimo added to the adjective)

analytical (superlativo absoluto analítico)

Formed by adding adverb before the adjective (usually muito, but other adverbs are used also).

muito caro

NOTICE: This form is used used usually in colloquial speech.

synthetical (superlativo absoluto sintético)

Absolutive superlative is made with íssimo-ending:

caro, muito caro, caríssimo

expensive, very expensive, extremely expensive

NOTICE: The ending of the adjective may change as -íssimo ending is added to it. For example calmo >> calmíssimo, feliz >> felicíssimo.

Irregular absolutive

superlatives:

fácil - facílimo the easiest

difícil - dificílimo the hardest

mau - péssimo the worst

bom - ótimo the best