The tree by the lake is an oak. the predicate noun in this sentence is

an oak

Explanation:

A predicate noun usually have a verb that precedes it in a sentence. This verb is usually known as linking verbs. A predicate noun is usually a noun phrase.

In the given example;

"The tree by the lake is an oak"

Is serves as the linking verb.  

an oak is the predicate noun because it contains a noun phrase and which renames the subject "The tree"

comfortable

explanation:

one type of the adjectives is predicate adjective. a predicate adjective is an adjective which follows a linking verb and modifies or refers back to the main subject of that linking verb.

it usually is used just before the noun it modies.

here in this example:

'penguins seem comfortable in the coolest habitats', comfortable is the predicate adjective which follows the linking verb 'seem' and modifies the noun.

everyman: morality play

which phrase in this excerpt from the play everyman refers to god's judgment of people's souls after their death?

messenger: . .

ye think sin in the beginning full sweet,

which in( the end) causeth thy soul to weep,

when the body lieth in clay.

here shall you see how fellowship and jollity,

both strength, pleasure, and beauty,

will fade from thee as flower in may.

for ye shall hear, how our heavenly king

calleth everyman to a (general reckoning):

give audience, and hear what he doth say.

god: i perceive here in my majesty,

how that all the creatures be to me unkind,

living without dread in worldly prosperity:

of (ghostly sight) the people be so blind,

drowned in sin, they know me not for their god;

in worldly riches is all their mind,

they fear not( my righteousness), the sharp rod;

(my law that i shewed), when i for them die

hopefully this !