The door could not be opened without using force.
=> Only using................................

I didn’t realize who he was until later.
=> Only later.............................

They had to wait for twelve hours before their flight left.
=> Only after................................

They didn’t get round to business until they had finished eating.
=> Only until........................

I understood Hamlet only after seeing it on the stage.
=> Only after..........................

It wasn’t until last week that the Agriculture Minister admitted defeat.
=> Only until..........................

I only realized how dangerous the situation had been when I got home.
=> Only when...............................

He only thought about having a holiday abroad after he retired.
=> Only after...............................

If I had realized what would happen, I wouldn’t have accepted the job.
=> Had I..................................

The facts were not all made public until later.
=> Only until.......................