swim---swims---swimming---swam
change---changes---changing---changed
buy---buys---buying---bought
enjoy---enjoys---enjoying---enjoyed
lie---lies---lying---lay
make---makes---making---made
swim---swims---swimming---swam
change---changes---changing---changed
buy---buys---buying---bought
enjoy---enjoys---enjoying---enjoyed
lie---lies---lying---lay
make---makes---making---made