Present simple. Present continuous

switch. is switching

turn. is turning

clean. is cleaning

carry. is carrying

feed. is feeding

box. is boxing

laugh. is laughing

fight. is fighting

talk. is talking

say is saying

can. is canning

dress. is dressing

explain. is explaining

switching switces

turning turns

cleaning cleans

carrying carries

feeding feeds

boxing boxes

laughing laughs

fighting fights

talking talks

saying says

не может меняться

dressing dresses

explaining explains