PP - sentences
catch blow be fly
caught/caught blew/blown was/were/been flew/flown
steal write sell ring
stole/stolen wrote/written sold/sold rang/rung
sting sweep swim take
stung/stung swept/swept swam/swum took/take
sink keep throw
sank/sunk kept/kept threw/thrown
understand forgive hide lay
understood/understood forgave/forgiven hid/hidden laid/laid