"Because 'it' is neuter gender."
"Could n't we say, 'The kitten might have been glad if it had known it was not going to be drowned'?"
"Ye-es," Miss Dearborn answered hesitatingly, never very sure of herself under Rebecca's fire; "but though we often speak of a baby, a chicken, or a kitten as 'it,' they are really masculine or feminine gender, not neuter."
Rebecca reflected a long moment and then asked, "Is a hollyhock neuter?"
"Oh yes, of course it is, Rebecca."
"Well, could n't we say, 'The hollyhock might have been glad to see it rain, but there was a weak little baby bud growing out of its stalk and it was afraid it might be hurt by the storm; so the big hollyhock was kind of afraid, instead of being real glad'?"
Miss Dearborn looked puzzled as she answered, "Of course, Rebecca, hollyhocks could not be sorry, or glad, or afraid, really."
"We can't tell, I s'pose," replied the child; "but I think they are, anyway. Now what shall I say?"
"The subjunctive mood, past perfect tense of the verb 'to know.'"
"If I had known
If thou hadst known
If he had known
If we had known
If you had known
If they had known"