For a while I have been using this table of sequences of verbs as a reference. Today I found this sentence, which doesn't correspond to either of the rules form the table:
You didn't answer the doorbell when I rang, so you must have gone to work early.
In the sentence above past simple is followed by present perfect.
I have several questions:
- In what cases present perfect is used aster past simple?
- Since the second action took place before the first one, why past perfect wasn't used:
You didn't answer the doorbell when I rang, so you must had gone to work early?
- Is the table I linked complete? Are there more possibilities of verbs sequences?