Present simple to Past simple
Present perfect continuous to past perfect continuous
Present perfect to past perfect
Past perfect continuous (no change)
Past simple to past perfect
Past perfect (No change)
Past perfect (No change)
Present continuous to past continuous
Present simple to Past simple
Past perfect continuous (no change)
Present continuous to past continuous
Present perfect to past perfect
Past continuous to past perfect continuous
Past simple to past perfect
Past continuous to past perfect continuous
Present perfect continuous to past perfect continuous
I worked hard
I have worked hard
I am working hard
I have been working hard
He said that he had been working hard
He said that he had been working hard.
He said that he was working hard
I was working hard
I work hard
He said that he had worked hard
He said that he worked hard
He said that he had worked hard