Student or Learner
I have tried to use "caught on to" in my sentences. Would you please correct my mistakes?
1. I told her a joke, but it took her some time until she caught on to it.
2. John had divorced but he seemed still not to caught on to it.
3. The old woman was confused and mumbled something, but nobody caught to what she was saying.
The first is just about usable. The second and third are not grammatical at all.
In BrE, the first would be "I told her a joke but it took her some time to get it". We use "get a joke" to mean "understand a joke".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.