Given a sentence, identify the subject and verb of that sentence.
He had already gone to bed.
In the sentence "He had already gone to bed," the subject is "He" and the verb is "had gone".
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a sentence, identify the subject and verb of that sentence.

### Input:
He had already gone to bed.

### Output:
In the sentence "He had already gone to bed," the subject is "He" and the verb is "had gone".