The term "had known" is the past perfect tense.
Had is an auxiliary verb. Known is the past participle of the verb know.
The word known is a verb. It is the past participle of the verb know.
The word known is a verb. It is the past participle of the verb know.
The action in a sentence is the part of speech known as a verb.
The part of speech that the word my is used as is an adjective.
The part of speech for this particular word is a noun.
The word private is an adjective. It describes something that is not publicly known.
The word 'should' is part of speech. It is a verb form which is known as modal verb.
The part of speech for the word civilian is English grammar.
The part of speech for the word diplomacy is a noun.
H is a letter, not a word. To be a part of speech, it needs to be a word.
The part of speech for the word "boulevard" is a noun.
The word speech is a noun.