"I'm tired."
She/he said he was tired.
She might be at the gym, but I’m not sure.
weak certainty
I will go to the store tomorrow.
simple future
If it rains, we’ll stay inside.
first conditional
"I'll call you later."
She/he told me she would call later.
He must have forgotten his homework.
Strong certainty
Scientists say humans will live on Mars someday.
simple future
If I were you, I’d take the job.
second conditional
"Did you finish the work?"
She/he asked if I had finished the work.
She might have taken the wrong train.
weak certainty
By the time we arrive, the movie will have started.
future perfect
I wouldn’t be tired if I had gone to bed earlier.
mixed conditional (3rd + 2nd)
"I've been waiting for an hour."
She/he said he had been waiting for an hour.
You should have studied more for the exam.
good certainty
By next year, he will have finished college.
future perfect
If she had studied, she would have passed.
third conditional
"I could have helped if you had asked"
She/he said she/he could have helped if I had asked.
You couldn’t have seen him—he left an hour ago.
strong certainty
This time tomorrow, I will be flying to Rome.
future continuous
If I hadn’t missed the train, I would be at work now.
mixed conditional (3rd + 2nd)