How's the heat?

This is a modal complement. The so-called modal complement sentence refers to adding "de" after the verb or adjective, and then connecting the complement. The complement that can be added at the back of this sentence is:

1 is an adverb indicating modal complement, such as:

(1) It's very hot.

(2) the heat is unbearable.

It's incredibly hot.

The weather is very hot.

It's terribly hot.

It's terribly hot.

2. You can also connect the subject-predicate structure as a complement to express the result, such as:

(1) The heat makes me dizzy.

The weather is unbearable.

It's so hot that I feel dizzy.

It's so hot that everyone is fidgeting.

3。 Preposition phrases can also be used as complements to indicate the degree of heat, such as:

(1) It's as hot as a stove.

(2) It's as hot as a steamer.

As hot as the earth is about to explode.